key - Scioly.org
... B0IVe. Which of the following inferences about the two stars is incorrect? [2] (a) Cygnus OB2-12 is younger than Gamma Cassiopeiea (b) Cygnus OB2-12 is a variable star, whereas Gamma Cassiopeiea is not (c) Gamma Cassiopeiea has a circumstellar disk, while Cygnus OB2-12 does not (d) Gamma Cassiopeiea ...
... B0IVe. Which of the following inferences about the two stars is incorrect? [2] (a) Cygnus OB2-12 is younger than Gamma Cassiopeiea (b) Cygnus OB2-12 is a variable star, whereas Gamma Cassiopeiea is not (c) Gamma Cassiopeiea has a circumstellar disk, while Cygnus OB2-12 does not (d) Gamma Cassiopeiea ...
PPT
... Radial velocities to a few km/s complete to V=17-18 15-band photometry (250-950nm) at ~100 epochs over 4 years Complete survey of the sky to V=20, observing 109 objects: 108 binary star systems (detected astrometrically; 105 orbits) 200 000 disk white dwarfs 50 000 brown dwarfs 50 000 planetary syst ...
... Radial velocities to a few km/s complete to V=17-18 15-band photometry (250-950nm) at ~100 epochs over 4 years Complete survey of the sky to V=20, observing 109 objects: 108 binary star systems (detected astrometrically; 105 orbits) 200 000 disk white dwarfs 50 000 brown dwarfs 50 000 planetary syst ...
Chapter 12 Our Place in the Universe
... brightness with a regular period. She also found that the length of time for a star to complete a cycle of bright to dim to bright again depended on the size of the star. She did this by looking at nearby Cepheids of known distance. So if you observed a Cepheid variable and measured the changes in b ...
... brightness with a regular period. She also found that the length of time for a star to complete a cycle of bright to dim to bright again depended on the size of the star. She did this by looking at nearby Cepheids of known distance. So if you observed a Cepheid variable and measured the changes in b ...
numerical exercises
... So ~1011 M is derived for the mass of the Galaxy internal to the Sun. If the orbital velocity curve is flat to ~16 kpc from the Galactic centre, then one can redo the calculations to find that ~21011 M is derived for the mass of the Galaxy internal to ~16 kpc from the centre. Where did the extra ...
... So ~1011 M is derived for the mass of the Galaxy internal to the Sun. If the orbital velocity curve is flat to ~16 kpc from the Galactic centre, then one can redo the calculations to find that ~21011 M is derived for the mass of the Galaxy internal to ~16 kpc from the centre. Where did the extra ...
Galaxy evolution - Pontifical Academy of Sciences
... changed substantially since then. If the quiescent phase of disk assembly starts early, as current cosmological simulations suggest, secular evolution might have already been operating by z~1. There is also recent evidence for a rapid secular galaxy evolution. Genzel et al. (2008) have provided obse ...
... changed substantially since then. If the quiescent phase of disk assembly starts early, as current cosmological simulations suggest, secular evolution might have already been operating by z~1. There is also recent evidence for a rapid secular galaxy evolution. Genzel et al. (2008) have provided obse ...
David S. Stevenson
... years, providing a very steady candle with which to light their retinue of worlds. However, red dwarfs throw up a wealth of seemingly contradictory conditions that grossly affect whether a planet will be habitable. Planets orbiting these little crimson suns have a unique set of problems that could, ...
... years, providing a very steady candle with which to light their retinue of worlds. However, red dwarfs throw up a wealth of seemingly contradictory conditions that grossly affect whether a planet will be habitable. Planets orbiting these little crimson suns have a unique set of problems that could, ...
The 22 First Magnitude Stars
... • We are on the Earth’s surface • Earth’s radius (4000 mi) is insignificant compared to stellar distances (25 trillion miles to nearest star) • So we can simplify: – move our origin to the center of the Earth – ignore distance and deal only in ...
... • We are on the Earth’s surface • Earth’s radius (4000 mi) is insignificant compared to stellar distances (25 trillion miles to nearest star) • So we can simplify: – move our origin to the center of the Earth – ignore distance and deal only in ...
It`s cosmic! - NSW Department of Education
... A star becomes unstable as it gets older. Then it collapses to form a very hot small star called a white dwarf. ...
... A star becomes unstable as it gets older. Then it collapses to form a very hot small star called a white dwarf. ...
Astronomy and the Bible
... physics demand some special conditions for star formation and also for a long time period. A cloud of hydrogen gas must be compressed to a sufficiently small size so that gravity dominates. In space, however, almost every gas cloud is light-years in size, hundreds of times greater than the critical ...
... physics demand some special conditions for star formation and also for a long time period. A cloud of hydrogen gas must be compressed to a sufficiently small size so that gravity dominates. In space, however, almost every gas cloud is light-years in size, hundreds of times greater than the critical ...
Chapter 13 Neutron Stars and Black Holes
... The probe itself, however, does not experience any such shifts; time would appear normal to ...
... The probe itself, however, does not experience any such shifts; time would appear normal to ...
H Exhaustion - University of Arizona
... core. All L from small r so burning takes place at higher temperatures in shells • Thermodynamic gradients outside shell very steep excess L goes into expanding star to flatten gradients - star moves to red • Higher mass stars (~2M) have non-degenerate cores -don’t produce enough L in shell to su ...
... core. All L from small r so burning takes place at higher temperatures in shells • Thermodynamic gradients outside shell very steep excess L goes into expanding star to flatten gradients - star moves to red • Higher mass stars (~2M) have non-degenerate cores -don’t produce enough L in shell to su ...
telescope as time machine - Galaxy Evolution Explorer
... gather galactic light that has been journeying toward us for nearly the entire history of the universe. ...
... gather galactic light that has been journeying toward us for nearly the entire history of the universe. ...
Astronomy 110 Announcements: How are the lives of stars with
... What’s strange about this pairing? How did it come about? ...
... What’s strange about this pairing? How did it come about? ...
The Solar System Interplanetary Matter and the Birth of the Planets
... Our Sun and the planets originated from the collapse of an interstellar cloud of dust and gas (nebula) • Normally the gas and dust does not collapse by itself. But a pressure wave generated from a supernova explosion or a density wave in the galaxy may compress the cloud and trigger the collapse. • ...
... Our Sun and the planets originated from the collapse of an interstellar cloud of dust and gas (nebula) • Normally the gas and dust does not collapse by itself. But a pressure wave generated from a supernova explosion or a density wave in the galaxy may compress the cloud and trigger the collapse. • ...
Galaxies - sciencejedi.com
... • So the galaxy has at least the mass of 100 billion suns. All told, measurements suggest that the total mass is on order of 100 trillion solar masses (1012 M⊙ ). • In 2005, it was discovered that the Milky Way does not have a spherical bulge, but rather an elongated bar structure in the core. The b ...
... • So the galaxy has at least the mass of 100 billion suns. All told, measurements suggest that the total mass is on order of 100 trillion solar masses (1012 M⊙ ). • In 2005, it was discovered that the Milky Way does not have a spherical bulge, but rather an elongated bar structure in the core. The b ...
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.