a MS Word version.
... 18. Describe the main "standard candles" that are used to measure the distances to galaxies that are used to determine the Hubble redshift relation. What is the approximate current best value for Hubble's constant? Given this constant, how is the Hubble relation used to determine the distance to far ...
... 18. Describe the main "standard candles" that are used to measure the distances to galaxies that are used to determine the Hubble redshift relation. What is the approximate current best value for Hubble's constant? Given this constant, how is the Hubble relation used to determine the distance to far ...
Prospecting for Planets – Radial Velocity Searches
... The first planet orbiting a star other than our Sun (or 'exoplanet') was discovered in 1992, orbiting an odd type of star known as a pulsar. It wasn't until three years later that the next exoplanet was discovered, this time around a star similar to our Sun. Since then the number of exoplanets we ha ...
... The first planet orbiting a star other than our Sun (or 'exoplanet') was discovered in 1992, orbiting an odd type of star known as a pulsar. It wasn't until three years later that the next exoplanet was discovered, this time around a star similar to our Sun. Since then the number of exoplanets we ha ...
Astronomy and Cosmology - spring 2003 - final exam
... 48. The two ranges of electromagnetic radiation for which Earth's atmosphere is reasonably transparent are A) UV and radio waves. C) X rays and visible radiation. B) visible and far infrared radiation. D) visible and radio radiation. ...
... 48. The two ranges of electromagnetic radiation for which Earth's atmosphere is reasonably transparent are A) UV and radio waves. C) X rays and visible radiation. B) visible and far infrared radiation. D) visible and radio radiation. ...
Planet-like Companion to a Brown Dwarf
... of a giant gas planet. In the third and distinctly different one—the cloud fragmentation model—a companion forms directly from the collapse of a vast cloud of gas and dust in the same manner as its star (or brown dwarf) rather than forming in a disk. If this is what actually took place, then the dis ...
... of a giant gas planet. In the third and distinctly different one—the cloud fragmentation model—a companion forms directly from the collapse of a vast cloud of gas and dust in the same manner as its star (or brown dwarf) rather than forming in a disk. If this is what actually took place, then the dis ...
MOLECULAR GAS, KINEMATICS, AND OB STAR FORMATION IN
... optical extinction, kinematical distances are usually the only ones available. Massive stars are formed within aggregates of molecular gas and dust of 105 -106 solar masses, about 50-100 pc in size, which are commonly known as giant molecular clouds, or GMCs for short. The association between OB sta ...
... optical extinction, kinematical distances are usually the only ones available. Massive stars are formed within aggregates of molecular gas and dust of 105 -106 solar masses, about 50-100 pc in size, which are commonly known as giant molecular clouds, or GMCs for short. The association between OB sta ...
Question 1
... The location of the Galactic center was identified early in the 20th century using a) supernova remnants. b) white dwarf stars in the spiral arms. c) red giant variable stars in globular clusters. d) bright O and B stars in open clusters. e) X-ray sources. Explanation: Harlow Shapley used pulsating ...
... The location of the Galactic center was identified early in the 20th century using a) supernova remnants. b) white dwarf stars in the spiral arms. c) red giant variable stars in globular clusters. d) bright O and B stars in open clusters. e) X-ray sources. Explanation: Harlow Shapley used pulsating ...
The First Star at Night
... Currently, and unsurprisingly, it is Sirius, the brightest star in the night sky. Sirius is also known as Alpha Canis Majoris, being the brightest star in the constellation of Canis Major, The Great Dog. As the twilight begins in early February, Sirius becomes visible high in the north eastern sky, ...
... Currently, and unsurprisingly, it is Sirius, the brightest star in the night sky. Sirius is also known as Alpha Canis Majoris, being the brightest star in the constellation of Canis Major, The Great Dog. As the twilight begins in early February, Sirius becomes visible high in the north eastern sky, ...
No Slide Title
... a) white dwarf, red giant, main sequence, protostar b) red giant, main-sequence, white dwarf, protostar c) protostar, red giant, main sequence, white dwarf d) protostar, main sequence, white dwarf, red giant e) protostar, main sequence, red giant, white dwarf ...
... a) white dwarf, red giant, main sequence, protostar b) red giant, main-sequence, white dwarf, protostar c) protostar, red giant, main sequence, white dwarf d) protostar, main sequence, white dwarf, red giant e) protostar, main sequence, red giant, white dwarf ...
Stellar population models in the Near-Infrared Meneses
... Clouds. Furthermore, predicted absorption line indices have been compared to published indices of other elliptical galaxies. The comparisons show that our models are well suited for studying stellar populations in unresolved galaxies, which are located sufficiently far away from us that it is not po ...
... Clouds. Furthermore, predicted absorption line indices have been compared to published indices of other elliptical galaxies. The comparisons show that our models are well suited for studying stellar populations in unresolved galaxies, which are located sufficiently far away from us that it is not po ...
Test 4 Review
... The quasars we see are very distant, meaning they existed a long time ago. Therefore, they may represent an early stage in galaxy development. The quasars in this image are shown with their host galaxies. ...
... The quasars we see are very distant, meaning they existed a long time ago. Therefore, they may represent an early stage in galaxy development. The quasars in this image are shown with their host galaxies. ...
chap7 (WP)
... The historical origin of the pc is discussed in Sec. 7.B. Not only do other stars appear to have planets, a significant fraction of stars have companion stars that orbit each other as a binary pair. Stars themselves are not uniformly distributed throughout space, but are usually found in swarms in t ...
... The historical origin of the pc is discussed in Sec. 7.B. Not only do other stars appear to have planets, a significant fraction of stars have companion stars that orbit each other as a binary pair. Stars themselves are not uniformly distributed throughout space, but are usually found in swarms in t ...
1448 Rapid Contraction of a Protostar to the Stage of Quasi
... study have also been summarized by Hayashi. 6) According to the above study, the initial stage of the opaque protostar, from which an adiabatic contraction begins, is determined mainly by the cooling effect of grains, almost irrespective of its previous history. The mean density and temperature of t ...
... study have also been summarized by Hayashi. 6) According to the above study, the initial stage of the opaque protostar, from which an adiabatic contraction begins, is determined mainly by the cooling effect of grains, almost irrespective of its previous history. The mean density and temperature of t ...
SMMP_BISANA - Infinity and Beyond
... When a temperature of about 27,000,000°F is reached, nuclear fusion begins. This is the nuclear reaction in which hydrogen atoms are converted to helium atoms plus energy. This energy (radiation) production prevents further contraction of the star. ...
... When a temperature of about 27,000,000°F is reached, nuclear fusion begins. This is the nuclear reaction in which hydrogen atoms are converted to helium atoms plus energy. This energy (radiation) production prevents further contraction of the star. ...
Photographs of a Star Cluster Spectra of a Star Cluster
... emitting light is moving towards you or away from you. – An object moving “side to side” or perpendicular, relative to your line of sight, will not experience a Doppler Effect. ...
... emitting light is moving towards you or away from you. – An object moving “side to side” or perpendicular, relative to your line of sight, will not experience a Doppler Effect. ...
AAS08 - Caltech Optical Observatories
... Swift J1955+2614, one of the strangest transients of recent years [3-5]. This galactic transient was discovered in the galactic plane by the Swift Gamma-Ray-Burst detector satellite. Followup observations revealed an extremely complex (and still poorly understood) light curve, followed by rapid fadi ...
... Swift J1955+2614, one of the strangest transients of recent years [3-5]. This galactic transient was discovered in the galactic plane by the Swift Gamma-Ray-Burst detector satellite. Followup observations revealed an extremely complex (and still poorly understood) light curve, followed by rapid fadi ...
Neutron Density and Neutron Source Determination in Barium
... (1.9 arcsec) with brightness difference about 3.6 mag. The influence of the faint star is ::5 0.01 mag., but the influence varies with seeing and guiding. The light curve is complicated and the time interval is not long enough for it to be anaIysed. This would be the first known variable at the inte ...
... (1.9 arcsec) with brightness difference about 3.6 mag. The influence of the faint star is ::5 0.01 mag., but the influence varies with seeing and guiding. The light curve is complicated and the time interval is not long enough for it to be anaIysed. This would be the first known variable at the inte ...
HR Diagram Explorer
... Uncheck show luminosity classes and check show instability strip. Note that this region of the HR Diagram indicates where pulsating stars are found such as RR Lyrae stars and Cepheid variable stars. These stars vary in brightness because they are pulsating – alternately growing bigger and smaller – ...
... Uncheck show luminosity classes and check show instability strip. Note that this region of the HR Diagram indicates where pulsating stars are found such as RR Lyrae stars and Cepheid variable stars. These stars vary in brightness because they are pulsating – alternately growing bigger and smaller – ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.