UV irradiation of polycyclic aromatic hydrocarbons in ices: production of alcohols, quinones, and ethers. (1/47)
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. (2/47)
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. (3/47)
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. (4/47)
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? (5/47)
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. (6/47)
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)Titanium carbide nanocrystals in circumstellar environments. (7/47)
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)Windows through the dusty disks surrounding the youngest low-mass protostellar objects. (8/47)
The formation and evolution of young low-mass stars are characterized by important processes of mass loss and accretion occurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (class 0 sources), they were previously detected only at radio wavelengths using interferometric techniques. We have detected with the Infrared Space Observatory the mid-infrared (mid-IR) emission associated with the class 0 protostar VLA1 in the HH1-HH2 region located in the Orion nebula. The emission arises in three wavelength windows (at 5. 3, 6.6, and 7.5 micrometers) where the absorption due to ices and silicates has a local minimum that exposes the central part of the young protostellar system to mid-IR investigations. The mid-IR emission arises from a central source with a diameter of 4 astronomical units at an averaged temperature of approximately 700 K, deeply embedded in a dense region with a visual extinction of 80 to 100 magnitudes. (+info)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.
2012 phenomenon
Equinox
Solar phenomena
Astronomy on Mars
Transequatorial loop
Ephemeris
Astrological age
Winifred Cameron
Spica
Cosmas Damian Asam
Maya astronomy
Quito Astronomical Observatory
Omar Khayyam (silent film)
Keyna Wilkins
Nüzhet Gökdoğan
Maya civilization
Histoire céleste française
Chandra Wickramasinghe
Nadia Drake
J. Cecil Maby
Gloria Suzanne Koenigsberger Horowitz
Moreton wave
Edmund Neville Nevill
Star system
Pinsoro
Mirage of astronomical objects
Sun Circle (sculpture)
Absorbance
Xia-Shang-Zhou Chronology Project
Tidal range
Possible Transient Lunar Phenomena - British Astronomical Association
ANNULAR SOLAR ECLIPSE: How to view the rare astronomical phenomenon
Sky gazers in Egypt blessed with lots of astronomical phenomena in October - EgyptToday
Mysteries of the Universe and astronomical phenomena - Astronoo
도깨비 (Tokkaebi) - 천문 (Astronomical Phenomena) | Metal Kingdom
Paul D. Maley - Astronomical Phenomena
10 Strangest Astronomical Phenomena In Our Galaxy
amateur observing - RSS feed for notable astronomical phenomena? - Astronomy Stack Exchange
The opposition of Mars, 2016: Part II - British Astronomical Association
2012 phenomenon - Wikipedia
Pdf Lights In The Sky Identifying And Understanding Astronomical And Meteorological Phenomena 2007
5 Different Planets Will Be Visible At The Same Time In A Rare Astronomical Phenomenon Tonight - Secret Chicago
sci.astro] General (Astronomy Frequently Asked Questions) (2/9)
Single-shot ultrafast imaging attaining 70 trillion frames per second | Nature Communications
Physics in the medieval Islamic world - Wikipedia
High cadence optical transient searches using drift scan imaging II: Event rate upper limits on optical transients of duration ...
101 Creepy Canadian Jokes | Scholastic Canada
NASA Science at Home | Science Mission Directorate
2017 Solar Eclipse | KUER
SA part of pioneering experiment | ITWeb
Publications-SIS
Cassini data shows Saturn's rings likely a recent phenomenon - Astronomy Now
Wednesday, February 25, 1998 NYT crossword by Robert H. Wolfe
Symmetry | Free Full-Text | X-ray Self-Emission Imaging of Hydrodynamic Laser-Induced Astrophysical Phenomena
Arthur C. Clarke's Mysterious World (1980) - | Synopsis, Characteristics, Moods, Themes and Related | AllMovie
Dewey Decimal Classification - The Art and Popular Culture Encyclopedia
Mayan Calendar - 2012 Phenomenon - Crystalinks
Astrophysics authors/titles Nov 2018 (80 skipped)
New Testament - The Good Book Blog - Biola University
Radio observations point to likely explanation for neutron-star merger phenomena | ScienceDaily
Astrophysical Phenomena1
- In this article, we present an overview of the application of X-ray self-emission methods for the imaging of hydrodynamic astrophysical phenomena in laboratory-scale experiments. (mdpi.com)
Rare astronomical phenomenon1
- Herod (and others in Jerusalem) had not seen the star at all and had to ask the magi when they had seen the star, not because he (and his advisers) simply had missed some natural yet rare astronomical phenomenon (or at least missed its importance), but because he could not see the "star," nor could anyone else except the magi. (equip.org)
Astronomy6
- According to Professor of Astronomy Dr. Ashraf Tadros, the phenomena can been seen by naked eye. (egypttoday.com)
- Astronomy makes it possible for us to study phenomena at scales of size, mass, distance, density, temperature, etc., and especially on TIME scales that are not possible to reproduce in the laboratory. (faqs.org)
- Greek astronomy is characterized by seeking a geometrical model for celestial phenomena. (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)
- She works to elevate the scientific reputation of the observatory as an institution that has spent 125 years on the leading edge of astronomy research, and to raise the public profile of the observatory as a place where visitors can experience the awe and wonder of astronomical discovery. (aosny.org)
- Hubble science has rewritten astronomy textbooks as its discoveries continually provide deeper explanations of astronomical objects and unveil new phenomena. (nasa.gov)
Doomsday scenarios2
- Mayan scholars stated that no classic Mayan accounts forecast impending doom, and the idea that the Long Count calendar ends in 2012 misrepresented Mayan history and culture.Astronomers rejected the various proposed doomsday scenarios as pseudoscience which is refuted by elementary astronomical observations. (crystalinks.com)
- Many of the supposed 2012 doomsday scenarios involve astronomical phenomena: A rogue planet, solar storms or a planetary alignment. (livescience.com)
Observations6
- For a long time I have been searching for a weekly RSS feed similar to the German-speaking astronews.com which features a few astronomical phenomena one could observe with amateur equipment, and a few highlights of recent professional observations. (stackexchange.com)
- Some observations between mid-February and mid-May do show the phenomenon close to the limb. (britastro.org)
- Astronomical theories and observations test our fundamental theories, on which our technology is based. (faqs.org)
- In our 89.7 deg$^2$ h of observations, we find no candidate astronomical transients, giving an upper limit to the rate of these transients of 0.8 per deg$^2$ per day, competitive with other experiments of this type. (harvard.edu)
- In fact, astronomical observations routinely account for this atmospheric refraction to correct for apparent positions. (atoptics.co.uk)
- The Moon and stars and the whole sky are similarly raised and astronomical observations are routinely corrected for 'atmospheric refraction'.The effect is small except near to the horizon when the rays are literally bent a little around the curve of the Earth. (atoptics.co.uk)
Alignments2
- Various astronomical alignments and numerological formulae were proposed for this date. (crystalinks.com)
- Likewise, Yeomans said, there are no planetary alignments or other astronomical anomalies set for Dec. 21, 2012. (livescience.com)
20231
- The Astronomical Almanac for the Year 2023 contains a wide variety of both technical and general astronomical information. (gpo.gov)
Astrological2
- Through the years there have been many hypothetical explanations, whether natural, astronomical, or astrological, of the nature and behavior of this so-called star of Bethlehem. (equip.org)
- Chapter Two begins with an overview of Bureus' early life and education, and proceeds to chart his lifelong engagement with astronomical, astrological, and cosmological questions, introducing a number of the key components of his thought, and showing how his antiquarian pursuits were firmly embedded in a complex web of broader scientific, philosophical, and spiritual concerns. (lu.se)
Solar1
- In the oldest European texts, the Iliad and the Odyssey , Homer has noted several astronomical phenomena including solar eclipses. (wikipedia.org)
Processes1
- There are three completely different worlds that affect - and are affected by large and complex climatological, geological, and astronomical processes. (lu.se)
Rogue1
- Test your luck and see if you can capture some astronomical phenomena, like rogue exoplanets! (nasa.gov)
Time5
- The next time this type of astronomical phenomenon will come close to the Alamo City isn't until 2077! (ksat.com)
- Unfortunately, it is unable to record the event in real-time and thus only applicable to phenomena that are highly repeatable. (nature.com)
- April Vihilidal's recent Archeo-astronomical discovery, of August 2012, is the Archeo-astronomical find of the time. (podomatic.com)
- This was the first time any astronomical object had been seen with both gravitational waves and electromagnetic waves. (sciencedaily.com)
- The next time you find yourself marveling at a flattened sun, you'll have a deeper understanding of the science behind this enchanting phenomenon. (atoptics.co.uk)
20211
- CAIRO - 13 October 2021: Sky gazers in Egypt are blessed with lots of astronomical phenomena that will decorate the sky during October. (egypttoday.com)
Curious1
- Temple lists a number of astronomical beliefs held by the Dogon that seem curious. (ufoevidence.org)
Scientists4
- Keep reading to learn about ten of the strange, captivating, and weird astronomical phenomena that our scientists and engineers have captured so far! (astrojunkies.com)
- More recently, scientists have written off the alien communication theory and have settled on the most likely culprit for these strange astronomical phenomena. (astrojunkies.com)
- It's just one more bit of galaxy phenomena for scientists to decode in the future! (astrojunkies.com)
- The timing and strength of the electromagnetic radiation at different wavelengths provided scientists with clues about the nature of the phenomena created by the initial neutron-star collision. (sciencedaily.com)
Fundamental1
- A worldwide resource for fundamental astronomical data. (gpo.gov)
Moon2
- According to Tadros, the phenomena include: the New Moon, Dragon Meteor, Conjunction of the Moon and Venus, Conjunction of the moon with Saturn and Jupiter, Conjunction of Venus and Antares, Full moon, the Jabariyat meteors, and Mercury and Venus in their longest elongation. (egypttoday.com)
- They confirm that the object "was briefly captured by Earth's gravity as a mini-moon during its previous fly-by in 1991-1992", a phenomenon that has almost certainly happened in the past and will very probably happen again in the future. (cosmosmagazine.com)
Planets1
- Delivery of planetesimals to the white dwarf by orbiting planets is a leading candidate to explain these phenomena. (lu.se)
Object3
- How can we estimate if a certain astronomical object will be visible from a place on earth? (stackexchange.com)
- How difficult is it for an amateur to discover a new exoplanet or astronomical object? (stackexchange.com)
- And yet this stunning object is home to some utterly mind-blowing phenomena, many of which we have only just been discovered. (sunderlandastro.com)
Universe2
- Technically, every single thing about the universe could be disproven by a single astronomical anomaly. (astrojunkies.com)
- Hubble has not only furthered our knowledge of the known universe, it's shocked the astronomical world with never-before-seen phenomena. (nasa.gov)
Discovery1
- but they illustrate the challenge posed by trying to funnel down the rate of astronomical discovery into a ow-traffic RSS newsfeed that will not miss the good stuff. (stackexchange.com)
Objects2
- Furthermore, the methods revealed the hydrodynamic evolution, the spatial shape and structure, and spatial features of important parameters such as electron density and plasma temperature of astrophysical objects and related phenomena, which are also required for the verification of astrophysical models. (mdpi.com)
- The Antikythera mechanism was an analog computer from 150-100 BCE designed to calculate the positions of astronomical objects. (wikipedia.org)
Events2
- For announcements about currently or soon to be observable astronomical events. (irishastronomy.org)
- The film shows the sophistication of the structures, with their exacting calculations of astronomical events. (allmovie.com)
World1
- This video is part of a series that investigates unusual phenomena around the world. (allmovie.com)
Content1
- These are pdf lights in the sky identifying and understanding astronomical and and content cause Pages. (axyzinc.com)
Date1
- Sunderland Astronomical Society is planning another day trip for the forthcoming summer season (possibly July, August 2020 - Date TBD). (sunderlandastro.com)
View1
- A short epilogue pulls back in order to view the phenomenon of early seventeenth-century Swedish antiquarianism from the vantage point of the longue durée. (lu.se)
Science2
- KSAT Meteorologists go beyond the daily forecast to talk about science, weather phenomena, trivia and other fun topics. (ksat.com)
- In this article, we will delve into the science behind this intriguing phenomenon and uncover the factors that contribute to the creation of flattened suns. (atoptics.co.uk)
Data2
- Where can the public stream live astronomical data from? (stackexchange.com)
- Data collected during those orbits show the rings are a relatively recent phenomenon. (astronomynow.com)
Public2
- Join members of Sunderland & Durham Astronomical Societies at Rainton Meadows Nature Reserve for this public stargazing event. (sunderlandastro.com)
- and to maintain quality public education and outreach programs to bring the results of astronomical research to the general public. (aosny.org)
Society2
- In a paper published in the journal Monthly Notices of the Royal Astronomical Society , astronomers Carlos and Raul de la Fuente Marcos of the Universidad Complutense de Madrid in Spain revisit the rumour-laden history of 1991 VG and filter it through present day research. (cosmosmagazine.com)
- Back by popular demand, Sunderland Astronomical Society are will visiting Northumberland Park). (sunderlandastro.com)
Earth1
- This phenomenon is most noticeable near the horizon, where the curvature of the Earth plays a significant role. (atoptics.co.uk)
Find1
- Her pod casts are aimed at educating people about her Archeo-astronomical find. (podomatic.com)
System2
- Is there a standardized "Astronomical Alert" system? (stackexchange.com)
- They have a traditional belief in a heliocentric system and in elliptical orbits of astronomical phenomena. (ufoevidence.org)
Term1
- Michael Molnar has speculated that "in the east" could be an astronomical term meaning "at the heliacal rising" or "at the morning appearance" 2 of a planet. (equip.org)
Years2
- Some researchers theorised the rings formed along with the planet some 4.5 billion years ago while others thought they must be a relatively recent phenomenon, the result of a Kuiper Belt body that wandered too close and was ripped apart by Saturn's gravity. (astronomynow.com)
- Fluent in Arabic, she lived in Beirut, Lebanon, for three years while studying Arabic poetry and Arabian astronomical texts. (aosny.org)
Candidate1
- The candidate particles, ranging from protons to nuclei as massive as iron, generate "extensive air-showers" (EAS) in interactions with air nuclei when en- tering the Earth's atmosphere. (lu.se)
Connection1
- So what connection does an astronomical phenomenon like that have with pre-historic humans? (thebetterindia.com)
Series1
- Orbiting Astronomical Observatory: one of a series of scientific satellites that studied astronomical phenomena at ultraviolet and x-ray wavelengths. (dictionary.com)
Ancient1
- In later periods, ancient Greek astronomical works were translated and promulgated in other languages, most notably in Arabic by the astronomers and mathematicians within the various Arab-Muslim empires of the Middle Ages . (wikipedia.org)
Account1
- Some have tried to harmonize Matthew's account with naturally occurring astronomical phenomena by limiting the magi's observation of the star "in the east" to occurring only at its rising and not continually. (equip.org)
Great1
- The understanding of great physical phenomena characterizes humanity. (astronoo.com)