Astronomy
UV irradiation of polycyclic aromatic hydrocarbons in ices: production of alcohols, quinones, and ethers. (1/70)
Polycyclic aromatic hydrocarbons (PAHs) in water ice were exposed to ultraviolet (UV) radiation under astrophysical conditions, and the products were analyzed by infrared spectroscopy and mass spectrometry. Peripheral carbon atoms were oxidized, producing aromatic alcohols, ketones, and ethers, and reduced, producing partially hydrogenated aromatic hydrocarbons, molecules that account for the interstellar 3.4-micrometer emission feature. These classes of compounds are all present in carbonaceous meteorites. Hydrogen and deuterium atoms exchange readily between the PAHs and the ice, which may explain the deuterium enrichments found in certain meteoritic molecules. This work has important implications for extraterrestrial organics in biogenesis. (+info)Condensation of carbon in radioactive supernova gas. (2/70)
Chemistry resulting in the formation of large carbon-bearing molecules and dust in the interior of an expanding supernova was explored, and the equations governing their abundances were solved numerically. Carbon dust condenses from initially gaseous carbon and oxygen atoms because energetic electrons produced by radioactivity in the supernova cause dissociation of the carbon monoxide molecules, which would otherwise form and limit the supply of carbon atoms. The resulting free carbon atoms enable carbon dust to grow faster by carbon association than the rate at which the dust can be destroyed by oxidation. The origin of presolar micrometer-sized carbon solids that are found in meteorites is thereby altered. (+info)In search of planets and life around other stars. (3/70)
The discovery of over a dozen low-mass companions to nearby stars has intensified scientific and public interest in a longer term search for habitable planets like our own. However, the nature of the detected companions, and in particular whether they resemble Jupiter in properties and origin, remains undetermined. (+info)Black holes in the milky way galaxy. (4/70)
Extremely strong observational evidence has recently been found for the presence of black holes orbiting a few relatively normal stars in our Milky Way Galaxy and also at the centers of some galaxies. The former generally have masses of 4-16 times the mass of the sun, whereas the latter are "supermassive black holes" with millions to billions of solar masses. The evidence for a supermassive black hole in the center of our galaxy is especially strong. (+info)Is redshift-dependent evolution of galaxies a theoretical artifact? (5/70)
The physical validity of the hypothesis of (redshift-dependent) luminosity evolution in galaxies is tested by statistical analysis of an intensively studied complete high-redshift sample of normal galaxies. The necessity of the evolution hypothesis in the frame of big-bang cosmology is confirmed at a high level of statistical significance; however, this evolution is quantitatively just as predicted by chronometric cosmology, in which there is no such evolution. Since there is no direct observational means to establish the evolution postulated in big-bang studies of higher-redshift galaxies, and the chronometric predictions involve no adjustable parameters (in contrast to the two in big-bang cosmology), the hypothesized evolution appears from the standpoint of conservative scientific methodology as a possible theoretical artifact. (+info)Neutrinos. (6/70)
Neutrinos represent a new "window" to the Universe, spanning a large range of energy. We discuss the science of neutrino astrophysics and focus on two energy regimes. At "lower" energies ( approximately 1 MeV), studies of neutrinos born inside the sun, or produced in interactions of cosmic rays with the atmosphere, have allowed the first incontrovertible evidence that neutrinos have mass. At energies typically one thousand to one million times higher, sources further than the sun (both within the Milky Way and beyond) are expected to produce a flux of particles that can be detected only through neutrinos. (+info)Nebular and auroral emission lines of [Cl III] in the optical spectra of planetary nebulae. (7/70)
Electron impact excitation rates in Cl III, recently determined with the R-matrix code, are used to calculate electron temperature (T(e)) and density (N(e)) emission line ratios involving both the nebular (5517.7, 5537.9 A) and auroral (8433.9, 8480.9, 8500.0 A) transitions. A comparison of these results with observational data for a sample of planetary nebulae, obtained with the Hamilton Echelle Spectrograph on the 3-m Shane Telescope, reveals that the R(1) = I(5518 A)/I(5538 A) intensity ratio provides estimates of N(e) in excellent agreement with the values derived from other line ratios in the echelle spectra. This agreement indicates that R(1) is a reliable density diagnostic for planetary nebulae, and it also provides observational support for the accuracy of the atomic data adopted in the line ratio calculations. However the [Cl iii] 8433.9 A line is found to be frequently blended with a weak telluric emission feature, although in those instances when the [Cl iii] intensity may be reliably measured, it provides accurate determinations of T(e) when ratioed against the sum of the 5518 and 5538 A line fluxes. Similarly, the 8500.0 A line, previously believed to be free of contamination by the Earth's atmosphere, is also shown to be generally blended with a weak telluric emission feature. The [Cl iii] transition at 8480.9 A is found to be blended with the He i 8480.7 A line, except in planetary nebulae that show a relatively weak He i spectrum, where it also provides reliable estimates of T(e) when ratioed against the nebular lines. Finally, the diagnostic potential of the near-UV [Cl iii] lines at 3344 and 3354 A is briefly discussed. (+info)Titanium carbide nanocrystals in circumstellar environments. (8/70)
Meteorites contain micrometer-sized graphite grains with embedded titanium carbide grains. Although isotopic analysis identifies asymptotic giant branch stars as the birth sites of these grains, there is no direct observational identification of these grains in astronomical sources. We report that infrared wavelength spectra of gas-phase titanium carbide nanocrystals derived in the laboratory show a prominent feature at a wavelength of 20.1 micrometers, which compares well to a similar feature in observed spectra of postasymptotic giant branch stars. It is concluded that titanium carbide forms during a short (approximately 100 years) phase of catastrophic mass loss (>0.001 solar masses per year) in dying, low-mass stars. (+info)Astronomy is not a medical term, but rather it is a branch of science that deals with the study of celestial objects, phenomena, and processes outside the Earth's atmosphere. It involves observing stars, planets, galaxies, and other cosmic entities, and using physical laws to understand their properties and behavior.
Therefore, there is no medical definition for astronomy. However, it is worth noting that some areas of astronomy may have applications in medicine, such as the use of medical imaging techniques that were developed based on principles used in radio astronomy.
Astronomical phenomena are observable events that occur in the universe beyond our planet Earth. These can include a wide range of occurrences such as:
1. The movement and positions of celestial bodies like stars, planets, asteroids, comets, and galaxies.
2. Changes in the brightness or appearance of celestial objects, such as eclipses, transits, novae, and supernovae.
3. Phenomena related to the life cycles of stars, like stellar evolution, neutron star formation, black hole creation, etc.
4. Natural phenomena that occur in the interstellar medium or intergalactic space, such as nebulae, pulsars, quasars, and active galactic nuclei.
5. Gravitational effects on light, such as gravitational lensing and gravitational waves.
6. Phenomena related to the structure and evolution of the universe, like cosmic microwave background radiation and dark matter.
These phenomena are studied by astronomers using various observational techniques and instruments, including telescopes that detect different parts of the electromagnetic spectrum, as well as space-based observatories and astrophysical experiments.
Astronomy
Quenching (astronomy)
Galactic astronomy
Astronomy Domine
Fusor (astronomy)
Peryton (astronomy)
Astronomy Today
Cultural astronomy
Persian astronomy
Astronomy (magazine)
Dust astronomy
Meridian (astronomy)
AEGIS (astronomy)
Glowworm (astronomy)
Astronomy Now
Maya astronomy
SPEX (astronomy)
Astronomy Class
Sidewalk astronomy
Tempo (astronomy)
Tetrad (astronomy)
Geodetic astronomy
Egyptian astronomy
Void (astronomy)
Babylonian astronomy
Epoch (astronomy)
Magnitude (astronomy)
Astronomy Camp
Open Astronomy
Theoretical astronomy
Astronomy - Wikipedia
Ancient Greek astronomy - Wikipedia
Galaxies: Primeval twins | Nature Astronomy
Warp library (GNU Astronomy Utilities)
Pluto Puzzle - Zoom Astronomy
Astronomy Colloquium | www.caltech.edu
Astronomy in Downey, CA | ACTIVE
Audio | Astronomy 2009
Grant Wilson | Department of Astronomy
Astronomy - The University of Nottingham
Practical astronomy - Astrosurf
Doorstep Astronomy: See Scorching Sirius | Space
Asymmetric ashes | Astronomy.com
Careers in Astronomy | IAU
Taxahaw, SC Astronomy Weather Forecast | AccuWeather
Astronomy & Astrophysics - Sherpa Services
Astronomy and Earth Science
The forsaken | Astronomy Magazine
Heavens-Above - website - Astronomy
IYA2009 Updates | Astronomy 2009
Shakespeare: Did radical astronomy inspire Hamlet? | New Scientist
ether (in physics and astronomy) | Encyclopedia.com
Deconvolution, part 2 | Astronomy.com
IYA2009 Media Partners | Astronomy 2009
Cosmic 4th of July - Astronomy
Astronomy.FM Archives - Universe Today
Summer 2018 Physics & Astronomy graduates
Astrophysics10
- Astronomy" and "astrophysics" are synonyms. (wikipedia.org)
- In some cases, as in the introduction of the introductory textbook The Physical Universe by Frank Shu, "astronomy" may be used to describe the qualitative study of the subject, whereas "astrophysics" is used to describe the physics-oriented version of the subject. (wikipedia.org)
- However, since most modern astronomical research deals with subjects related to physics, modern astronomy could actually be called astrophysics. (wikipedia.org)
- Some fields, such as astrometry, are purely astronomy rather than also astrophysics. (wikipedia.org)
- Various departments in which scientists carry out research on this subject may use "astronomy" and "astrophysics", partly depending on whether the department is historically affiliated with a physics department, and many professional astronomers have physics rather than astronomy degrees. (wikipedia.org)
- Some titles of the leading scientific journals in this field include The Astronomical Journal, The Astrophysical Journal, and Astronomy & Astrophysics. (wikipedia.org)
- A good background in maths, physics, chemistry and computer science is required to be a modern astronomer - this means a scientific high school curriculum followed by earning a physics or maths or engineering university degree and a PhD in astronomy or astrophysics. (iau.org)
- This workshop brought together members of the astronomical, computing, and software communities to facilitate discussion and collaborations for data-intensive scientific computing, focusing on the science goals of the Astronomy and Astrophysics Decadal Survey. (nrao.edu)
- Physics, Engineering, and Astronomy is a student-focused department with an emphasis on undergraduate research with programs in Physics, Engineering Physics, and Astrophysics and minors in Physics and Astronomy. (apsu.edu)
- It is suitable for students who desire a non-mathematical minor in the subject, but can also be combined with a Physics Major and more advanced astronomy electives for students wishing to pursue Astronomy or Astrophysics in graduate school. (apsu.edu)
Physics and Astronomy3
- Alice Shapley is in the Department of Physics and Astronomy at the University of California Los Angeles, 430 Portola Plaza, Box 951547, Los Angeles, California 90095, USA. (nature.com)
- Astronomy Live's Summer Observing Workshop is hosted by the UCLA Department of Physics and Astronomy. (ucla.edu)
- Comprehensive physics and astronomy online education, research and reference web site founded in 1995 by a physicist Anton Skorucak. (physlink.com)
History of astron3
- The development of astronomy by the Greek and notably Hellenistic astronomers is considered to be a major phase in the history of astronomy . (wikipedia.org)
- Artist and author Fiami decided to answer this question in an accessible way by creating a well-illustrated and factually accurate comic providing a tour through the history of astronomy across Babylon, Alexandria, Kusumapura, Venice, Greenwich, and a classroom in 2009. (astronomy2009.org)
- See: Journal for the history of astronomy. (lu.se)
Observational astronomy3
- In the past, astronomy included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars. (wikipedia.org)
- Observational astronomy is focused on acquiring data from observations of astronomical objects. (wikipedia.org)
- The goal of the workshop is to offer students an introduction to scientific research through the lens of observational astronomy as a first step towards pursuing a career in science. (ucla.edu)
International Year of A2
- The International Year of Astronomy 2009 is endorsed by the United Nations and the International Council of Science . (astronomy2009.org)
- The World at Night in collaboration with Dark Skies Awareness project, organize the International Year of Astronomy 2009 Earth and Sky Photo Contest on the importance of dark skies. (astronomy2009.org)
Planetarium2
- Lycoming astronomy majors are trained in the field of planetarium education, which may serve as a basis for state certification as a secondary school teacher of general science. (lycoming.edu)
- ALVA arranges astronomy-related activities like public lectures, stargazing nights, planetarium shows and workshops. (lu.se)
Search1
- I will discuss the radio emission from exoplanets and brown dwarfs with particular focus on the OVRO-LWA, a low frequency radio astronomy array located in the Owens Valley, California, that will simultaneously monitors 4000 nearby stellar systems in the search for radio emission from exoplanets. (caltech.edu)
Sofia Feltzing1
- Opinion by Sofia Feltzing, Professor of Astronomy, Lund University 2013 Slowly, humanity has built up a picture of the world around us. (lu.se)
Astronomical4
- Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena. (wikipedia.org)
- A particularly important early development was the beginning of mathematical and scientific astronomy, which began among the Babylonians, who laid the foundations for the later astronomical traditions that developed in many other civilizations. (wikipedia.org)
- This is the sole route by which many ancient Greek astronomical works survived and in turn went on to influence later Indian and European astronomy. (wikipedia.org)
- In the coming weeks, conference organizers will release official Inclusive Astronomy recommendations for all members of the astronomical community. (planetary.org)
Collaborations1
- And remember that, as with most scientific disciplines nowadays, astronomy requires involvement in international collaborations, so good English communication skills are essential. (iau.org)
Science9
- Astronomy is a natural science that studies celestial objects and phenomena. (wikipedia.org)
- Most early astronomy consisted of mapping the positions of the stars and planets, a science now referred to as astrometry. (wikipedia.org)
- You can listen to this one-of-a-kind radio station on-line anytime, as it is streaming 24 hours a day and it includes both wonderful original astronomy programming and replays of many great astronomy shows and podcasts including Astronomy Cast, 365 Days of Astronomy, Planetary Radio, 60-Second Science and Slacker Astronomy, and also they have just recently added the Weekly Space Hangouts to their lineup. (universetoday.com)
- They also have science and astronomy news - the kind of stuff you really want to hear! (universetoday.com)
- This workshop is graciously sponsored by a grant from the National Science Foundation with additional contributions from the National Radio Astronomy Observatory, Associated Universities, Inc., and RAID, Inc. (nrao.edu)
- The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. (nrao.edu)
- Ten full-time faculty support active research areas include Astronomy, Computational Science, Engineering, and Materials Science. (apsu.edu)
- The purpose of the club is to provide a place for science students and other people interested in astronomy to get inspiration and to experience how exciting the Universe can be. (lu.se)
- Doctors have stated that trying to explain the logic behind pharmacology to someone who has had one year of high school science that includes botany, weather, geology, and astronomy won't get you far. (medscape.com)
Department1
- I lead the astronomy group at the department of Geology. (lu.se)
Cosmology1
- Cosmology is a branch of astronomy that studies the universe as a whole. (wikipedia.org)
Theoretical3
- Professional astronomy is split into observational and theoretical branches. (wikipedia.org)
- Theoretical astronomy seeks to explain observational results and observations are used to confirm theoretical results. (wikipedia.org)
- [1] Most of the names of the stars, planets, and constellations of the northern hemisphere are inherited from the terminology of Greek astronomy, [2] which are however indeed derived from the empirical knowledge in Babylonian astronomy , characterized by its theoretical model formulation in terms of algebraic and numerical relations, and to a lesser extent from Egyptian astronomy. (wikipedia.org)
Talks1
- A collection of TED Talks (and more) on the topic of Astronomy. (ted.com)
Celestial3
- Astronomy should not be confused with astrology, the belief system which claims that human affairs are correlated with the positions of celestial objects. (wikipedia.org)
- Greek astronomy is characterized by seeking a geometrical model for celestial phenomena. (wikipedia.org)
- Astronomy.com Tony Hallas provides step-by-step instructions on how to sharpen details in a slightly blurred celestial image without increasing the noise. (astronomy.com)
Universe2
- It is often used in astronomy as a measure of distance, because of Hubble's law which relates the redward shift in wavelength of the spectra of very distant objects to their distance and their epoch in the history of the universe. (nottingham.ac.uk)
- Astronomy.FM is billed as "The only all-Astronomy radio station in the Known Universe. (universetoday.com)
Greek4
- Astronomy (from the Greek ἀστρονομία from ἄστρον astron, "star" and -νομία -nomia from νόμος nomos, "law" or "culture") means "law of the stars" (or "culture of the stars" depending on the translation). (wikipedia.org)
- Ancient Greek astronomy is the astronomy written in the Greek language during classical antiquity . (wikipedia.org)
- Greek astronomy is understood to include the Ancient Greek , Hellenistic , Greco-Roman , and late antique eras. (wikipedia.org)
- This phase of Greek astronomy is also known as Hellenistic astronomy , while the pre-Hellenistic phase is known as Classical Greek astronomy . (wikipedia.org)
Events2
- Adding to this, the organisers planned to run sidewalk astronomy events. (astronomy2009.org)
- ALVA astronomy club is back with new, interesting events and we hope that you want to join us! (lu.se)
Faculty1
- All astronomy majors will have the chance to conduct independent research under the mentorship of faculty. (lycoming.edu)
University1
- ALVA is an astronomy club for university students in Lund. (lu.se)
Minor1
- The APSU Astronomy Minor is a versatile minor for students interested in the subject. (apsu.edu)
Lens1
- The connections between art and sciences are much stronger than the differences when one looks at them through a true liberal arts lens where grammar, rhetoric, logic, geometry, arithmetic, music, and astronomy are the basis of study and the point of learning is to analyze information, not just accumulate it. (cdc.gov)
Email2
- Get newsletters, updates and special offers via email from Astronomy.com! (astronomy.com)
- Email [email protected] with the words "Website Suggestion" in the subject heading. (sjsu.edu)
Scientific1
- Outside Astronomy I am very interested in advanced computational techniques, pedagogical techniques, and the philosophy of scientific inquiry. (umass.edu)
Field2
- Astronomy is a small field, but very popular. (iau.org)
- Instead, we spent three days examining fundamental questions in our field: Who gets to practice astronomy? (planetary.org)
Students1
- The workshop will be led by UCLA graduate students earning their Ph.D.'s in astronomy. (ucla.edu)
Space1
- On-air personality and Program Director Michael Foerster has an amazing voice that I could listen to all day, as well as having a wealth of knowledge about space and astronomy. (universetoday.com)
Fundamental1
- Perhaps you are thinking something like I did, before the conference: "These things are important, but inclusivity isn't a fundamental part of doing astronomy. (planetary.org)
People1
- Join us at the Astronomy Forum to discuss it with like-minded people. (bellaonline.com)
News1
- He writes about astronomy for The New York Times and other publications, and he is also an on-camera meteorologist for News 12 Westchester , New York. (space.com)
Education1
- Looking for fun activities, worksheets, and astronomy education resources? (uwm.edu)
Join1
- Join our local astronomy guru for a new way to experience the night sky. (winterparkresort.com)
Make2
- Check a star chart or an astronomy app before you head out to make the most of the night. (accuweather.com)
- How can we make astronomy more inclusive? (planetary.org)
Week1
- Seven NASA Airborne Astronomy Ambassadors (AAA) and two district liaisons traveled to Palmdale for their SOFIA flight week experience. (seti.org)
Updates1
- Subscribe for free weekly updates from this Astronomy site. (bellaonline.com)
Times1
- In early historic times, astronomy only consisted of the observation and predictions of the motions of objects visible to the naked eye. (wikipedia.org)