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Emily Levesque
Emily Levesque (born 1984) is an American astronomer, author, and associate professor in the Department of Astronomy at the University of Washington. She is known for her work on massive stars and using these stars to investigate galaxy formation. She is also the author of three books, including the 2020 popular science book ''The Last Stargazers: The Enduring Story of Astronomy's Vanishing Explorers''. Early life and education Levesque grew up in Taunton, Massachusetts. She received her undergraduate degree in physics at Massachusetts Institute of Technology in 2006, followed by a PhD in astronomy at the University of Hawaii in 2010. Academic career From 2010 to 2015, Levesque was a postdoctoral researcher at University of Colorado as an Einstein Fellow from 2010 to 2013, and then received a Hubble Fellowship from 2013 to 2015. She has been an assistant professor in the Department of Astronomy at the University of Washington since 2015. In 2015, Levesque, Rachel Bezanson, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taunton, Massachusetts
Taunton is a city in and the county seat of Bristol County, Massachusetts, United States. Taunton is situated on the Taunton River, which winds its way through the city on its way to Mount Hope Bay, to the south. As of the 2020 United States census, 2020 census, the city had a population of 59,408; this makes Taunton the third most populated municipality in Bristol County behind New Bedford, Massachusetts, New Bedford and Fall River, Massachusetts, Fall River. Shaunna O'Connell is the List of mayors of Taunton, Massachusetts, mayor of Taunton. Founded in 1637 by members of the Plymouth Colony, Taunton is one of the oldest towns in the United States. Taunton is also known as the "Silver City", as it was a historic center of the silver industry beginning in the 19th century when companies such as Reed & Barton, F. B. Rogers Silver Co., F. B. Rogers, Poole Silver, and others produced fine-quality silver goods in the city. Since December 1914, the city of Taunton has provided a l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GRE Physics Test
The Graduate Record Examination (GRE) physics test is an examination administered by the Educational Testing Service (ETS). The test attempts to determine the extent of the examinees' understanding of fundamental principles of physics and their ability to apply them to problem solving. Many graduate schools require applicants to take the exam and base admission decisions in part on the results. The scope of the test is largely that of the first three years of a standard United States undergraduate physics curriculum, since many students who plan to continue to graduate school apply during the first half of the fourth year. It consists of 70 five-option multiple-choice questions covering subject areas including the first three years of undergraduate physics. The International System of Units (SI Units) is used in the test. A table of information representing various physical constants and conversion factors is presented in the test book. Major content topics 1. Classical mechani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar day) that is synchronized to its orbital period (Lunar month#Synodic month, lunar month) of 29.5 Earth days. This is the product of Earth's gravitation having tidal forces, tidally pulled on the Moon until one part of it stopped rotating away from the near side of the Moon, near side, making always the same lunar surface face Earth. Conversley, the gravitational pull of the Moon, on Earth, is the main driver of Earth's tides. In geophysical definition of planet, geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is , roughly one-quarter of Earth's (about as wide as the contiguous United States). Within the Solar System, it is the List of Solar System objects by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthropod Eye
Eye#Apposition eyes, Apposition eyes are the most common form of eye, and are presumably the ancestral form of compound eye. They are found in all arthropod groups, although they may have evolved more than once within this phylum. Some annelids and bivalves also have apposition eyes. They are also possessed by ''Limulus'', the horseshoe crab, and there are suggestions that other chelicerates developed their simple eyes by reduction from a compound starting point. Some caterpillars appear to have evolved compound eyes from simple eyes in the opposite fashion. The arthropods ancestrally possessed Eye#Compound eyes, compound eyes, but the type and origin of this eye varies between groups, and some taxa have secondarily developed simple eyes. The organ's development through the lineage can be estimated by comparing groups that branched early, such as the Onychophora, velvet worm and horseshoe crab to the advanced eye condition found in insects and other Synapomorphy, derived arthr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irruption
Animal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most common form of migration in ecology. It is found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans. The cause of migration may be local climate, local availability of food, the season of the year or for mating. To be counted as a true migration, and not just a local dispersal or irruption, the movement of the animals should be an annual or seasonal occurrence, or a major habitat change as part of their life. An annual event could include Northern Hemisphere birds migrating south for the winter, or wildebeest migrating annually for seasonal grazing. A major habitat change could include young Atlantic salmon or sea lamprey leaving the river of their birth when they have reached a few inches in size. Some traditional forms of human migration fit this pattern. Migrations can be studied using traditiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HV 2112
HV 2112 is a cool luminous variable star in the Small Magellanic Cloud. Until 2018, it was considered to be the most likely candidate for a Thorne–Żytkow object, but it is now thought to be an asymptotic giant branch star. Discovery HV 2112 was first reported as a variable star in 1908, by Henrietta Leavitt. At the time it was identified as Harvard no. 2112. No period was given, but it was reported to be "probably long". The apparent magnitude, magnitude range was given as 13.7 to fainter than 16.5, from photographic plates. In 1966, analysis of Magellanic Cloud variable stars showed that HV 2112 had a photographic magnitude range from 13.0 to below 17.8. It was classified as a long-period variable, now known as a Mira variable, on the basis of its large amplitude and reasonably regular light variations, with a period of about 600 days. Possible object types AGB star HV 2112 had historically been treated as a very luminous asymptotic giant branch (AGB) star, a red gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thorne–Żytkow Object
A Thorne–Żytkow object (TŻO or TZO), a type of hybrid star, is a conjectured type of star wherein a red giant or Red supergiant star, red supergiant contains a neutron star at its core, formed from the Stellar collision, collision of the giant with the neutron star. Such objects were hypothesized by Kip Thorne and Anna Żytkow in 1977. In 2014, it was discovered that the star HV 2112, located in the Small Magellanic Cloud (SMC), was a strong candidate, though this view has since been refuted. Another possible candidate is the star HV 11417, also located in the SMC. Formation A Thorne–Żytkow object would be formed when a neutron star collides with another star, often a red giant or supergiant. The colliding objects can simply be wandering stars, though this is only likely to occur in extremely crowded globular clusters. Alternatively, the neutron star could form in a binary star, binary system when one of the two stars goes supernova. Because Supernova#Asymmetry, no super ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Red Supergiant
Red supergiants (RSGs) are stars with a supergiant luminosity class ( Yerkes class I) and a stellar classification K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous. Betelgeuse and Antares A are the brightest and best known red supergiants (RSGs), indeed the only first magnitude red supergiant stars. Classification Stars are classified as supergiants on the basis of their spectral luminosity class. This system uses certain diagnostic spectral lines to estimate the surface gravity of a star, hence determining its size relative to its mass. Larger stars are more luminous at a given temperature and can now be grouped into bands of differing luminosity. The luminosity differences between stars are most apparent at low temperatures, where giant stars are much brighter than main-sequence stars. Supergiants have the lowest surface gravities and hence are the largest and brightest at a particular temperature. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Las Campanas Observatory
Las Campanas Observatory (LCO) is an astronomy, astronomical observatory managed by the Carnegie Institution for Science (CIS). Located in Chile's Atacama Region, it sits about northeast of the city of La Serena, Chile, La Serena. The LCO's telescopes and facilities are positioned near the northern end of a Ridge, mountain ridge. Cerro Las Campanas, situated near the southern end of this ridge and standing over tall, will be the future site of the Giant Magellan Telescope. Established in 1969, LCO is CIS's primary observatory, having taken over this role from Mount Wilson Observatory due to increasing light pollution in the Los Angeles area. The headquarters of Carnegie Observatories is in Pasadena, California, while the main office in Chile is in La Serena, close to the University of La Serena and near the Association of Universities for Research in Astronomy facility. The observatory is served by Pelicano Airport, located to the southwest. Telescopes * The Magellan Telesc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mauna Kea
Mauna Kea (, ; abbreviation for ''Mauna a Wākea''); is a dormant Shield volcano, shield volcano on the Hawaii (island), island of Hawaii. Its peak is above sea level, making it the List of U.S. states by elevation, highest point in Hawaii and List of islands by highest point, the island with the second highest high point, behind New Guinea, the world's largest tropical island with multiple peaks that are higher. The peak is about higher than Mauna Loa, its more massive neighbor. Mauna Kea is unusually Topographic prominence, topographically prominent for its height: its prominence from sea level is List of mountain peaks by prominence, 15th in the world among mountains, at ; its prominence from under the ocean is , rivaled only by Mount Everest. This Topographic prominence#Wet prominence and dry prominence, dry prominence is greater than Everest's height above sea level of , and some authorities have labeled Mauna Kea the tallest mountain in the world, from its underwater ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gemini Observatory
The Gemini Observatory comprises two 8.1-metre (26.6 ft) telescopes, Gemini North and Gemini South, situated in Hawaii and Chile, respectively. These twin telescopes offer extensive coverage of the northern and southern skies and rank among the most advanced optical/infrared astronomy, infrared telescopes available to astronomers. ''(See List of largest optical reflecting telescopes)''. The observatory is owned and operated by the National Science Foundation (NSF) of the United States, the National Research Council Canada, National Research Council of Canada, CONICYT of Chile, MCTI of Brazil, MCTIP of Argentina, and Korea Astronomy and Space Science Institute, Korea Astronomy and Space Science Institute (KASI) of Republic of Korea. The NSF is the primary funding contributor, providing about 70% of the required resources. The Association of Universities for Research in Astronomy (AURA) manages the operations and maintenance of the observatory through a cooperative agreement wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spectrum
A spectrum (: spectra or spectrums) is a set of related ideas, objects, or properties whose features overlap such that they blend to form a continuum. The word ''spectrum'' was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism. In the optical spectrum, light wavelength is viewed as continuous, and spectral colors are seen to blend into one another smoothly when organized in order of their corresponding wavelengths. As scientific understanding of light advanced, the term came to apply to the entire electromagnetic spectrum, including radiation not visible to the human eye. ''Spectrum'' has since been applied by analogy to topics outside optics. Thus, one might talk about the " spectrum of political opinion", or the "spectrum of activity" of a drug, or the " autism spectrum". In these uses, values within a spectrum may not be associated with precisely quantifiable numbers or definitions. Such uses imply a bro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
