chapter16StarBirth
... Fusion and Contraction • Fusion will not begin in a contracting cloud if some sort of force stops contraction before the core temperature rises above 107 K. • Thermal pressure cannot stop contraction because the star is constantly losing thermal energy from its ...
... Fusion and Contraction • Fusion will not begin in a contracting cloud if some sort of force stops contraction before the core temperature rises above 107 K. • Thermal pressure cannot stop contraction because the star is constantly losing thermal energy from its ...
PPT Slides - Center for Computational Sciences
... Rock is dense: 2500 kg m-3 Even water is dense: 1000 kg m-3: Stars are denser: 105 kg m-3 at center The average density of the Universe is 10-27 kg m-3 Even within galaxies, interstellar gas has a density of 10-21 kg m-3, or 1 atom cm-3. • How did galaxies, stars and planets ever form? ...
... Rock is dense: 2500 kg m-3 Even water is dense: 1000 kg m-3: Stars are denser: 105 kg m-3 at center The average density of the Universe is 10-27 kg m-3 Even within galaxies, interstellar gas has a density of 10-21 kg m-3, or 1 atom cm-3. • How did galaxies, stars and planets ever form? ...
Stars: Their Life and Afterlife
... of years. Their lifetimes are linked to the time scales of stellar formation, which seems natural since the formation of massive stars can produce ionizing radiation, winds, and supernovae that are all capable of expelling or destroying molecular material. GMCs are frequently the sites of star forma ...
... of years. Their lifetimes are linked to the time scales of stellar formation, which seems natural since the formation of massive stars can produce ionizing radiation, winds, and supernovae that are all capable of expelling or destroying molecular material. GMCs are frequently the sites of star forma ...
General Astrophysical Concepts: Astronomical length scales
... to the black hole’s mass The event horizon or Schwarzschild radius of a black hole, the region over which it is capable of trapping light (radiation), is proportional to the black hole’s mass “A black hole has no hair” is a statement that describes the loss of identity of matter when it is swallowed ...
... to the black hole’s mass The event horizon or Schwarzschild radius of a black hole, the region over which it is capable of trapping light (radiation), is proportional to the black hole’s mass “A black hole has no hair” is a statement that describes the loss of identity of matter when it is swallowed ...
The Hubble Space Telescope
... 500 light years away 3 gigantic pillars of gas and dust Towers 4 light years tall Shows the early stages of a star Known as the pillars of creation ...
... 500 light years away 3 gigantic pillars of gas and dust Towers 4 light years tall Shows the early stages of a star Known as the pillars of creation ...
Mr - White Plains Public Schools
... 2. Stars like Earth’s Sun most likely formed directly from a (1) nebula (2) supernova (3) red giant (4) black dwarf 3. According to the diagram, the life-cycle path followed by a star is determined by the star’s initial (1) mass and size ...
... 2. Stars like Earth’s Sun most likely formed directly from a (1) nebula (2) supernova (3) red giant (4) black dwarf 3. According to the diagram, the life-cycle path followed by a star is determined by the star’s initial (1) mass and size ...
Marine Bio Lab CCR Notes Chapter 3
... Scientists theorize that stars formed when protostars became so dense that nuclear fusion began in their cores. Scientists theorize that heavy elements formed when light atoms within stars fused, becoming heavier atoms. In a star’s theorized life cycle, a supernova shock wave caused a nebula to cond ...
... Scientists theorize that stars formed when protostars became so dense that nuclear fusion began in their cores. Scientists theorize that heavy elements formed when light atoms within stars fused, becoming heavier atoms. In a star’s theorized life cycle, a supernova shock wave caused a nebula to cond ...
01 - Ionia Public Schools
... 11. What is important about the onset of fusion? _______________________________________________________________ _______________________________________________________________ 12. What happens as gravity increases the pressure on the matter within a star? ___________________________________________ ...
... 11. What is important about the onset of fusion? _______________________________________________________________ _______________________________________________________________ 12. What happens as gravity increases the pressure on the matter within a star? ___________________________________________ ...
The Birth of Stars
... of the Galaxy Clouds within the interstellar medium are called nebulae Dark nebulae are so dense that they are opaque – They appear as dark blots against a background of distant stars ...
... of the Galaxy Clouds within the interstellar medium are called nebulae Dark nebulae are so dense that they are opaque – They appear as dark blots against a background of distant stars ...
stars and galaxies – study guide
... 23. On an H-R Diagram, stars are classified by temperature and absolute magnitude. 24. What is the next stage of the sun? Red Giant 25. An example of a winter constellation is Orion. 26. White dwarf stars are hot, faint, Earth-sized stars. 27. A black hole is the densest object in the universe, and ...
... 23. On an H-R Diagram, stars are classified by temperature and absolute magnitude. 24. What is the next stage of the sun? Red Giant 25. An example of a winter constellation is Orion. 26. White dwarf stars are hot, faint, Earth-sized stars. 27. A black hole is the densest object in the universe, and ...
Quick Reference - Objects in the skies
... Plutoids are celestial bodies in orbit around the Sun at a semi-major axis greater than that of Neptune that have sufficient mass for their self-gravity to overcome rigid body forces so that they assume a hydrostatic equilibrium (nearspherical) shape, and that have not cleared the neighbourhood arou ...
... Plutoids are celestial bodies in orbit around the Sun at a semi-major axis greater than that of Neptune that have sufficient mass for their self-gravity to overcome rigid body forces so that they assume a hydrostatic equilibrium (nearspherical) shape, and that have not cleared the neighbourhood arou ...
Slide 1
... hot gas which looks like planetary disk, and called Planetary Nebulae (PNe) (nothing to do with planets per se) • PNe cores continue to cool and become White Dwarfs (94% stars end up as WDs) ...
... hot gas which looks like planetary disk, and called Planetary Nebulae (PNe) (nothing to do with planets per se) • PNe cores continue to cool and become White Dwarfs (94% stars end up as WDs) ...
Chapter 13: Interstellar Matter and Star Formation
... 1. Stars are born in the cold (20K), giant molecular clouds (GMCs) found in the Galaxy. Astronomers estimate that our Galaxy contains 5,000 GMCs. 2. The average density of a GMC is about 200 molecules/cm3; a typical cloud may be 50 pc across and contain as much as a million solar masses of material. ...
... 1. Stars are born in the cold (20K), giant molecular clouds (GMCs) found in the Galaxy. Astronomers estimate that our Galaxy contains 5,000 GMCs. 2. The average density of a GMC is about 200 molecules/cm3; a typical cloud may be 50 pc across and contain as much as a million solar masses of material. ...
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.