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| Death of a medium sized star |
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Definition
| It becomes a white dwarf, expels its outer layer, when the fusion turns off there is not enough matter to sustain itself |
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Definition
| They run out of stuff to fuse with, it takes energy to fuse and iron takes away from star so star collapses and blows its outer layer creating a supernova black hole or neutron |
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Term
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Definition
Exotic state of matter difficult to compress to smaller mass
Electron White dwarf neutron star |
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Definition
| the material surrounding a medium mass star during its death |
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Definition
No hydrogen in spectra
When a binary system strips the outer hydrogen layer from a massive star onto a second star |
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Definition
No Hydrogen in spectra
When a white dwarf in a binary star steals mass from companion star and reaches mass of 1.4 solar masses |
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Definition
| Have hydrogen lines and appear to be from the collapse and explosion of a massive star |
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Definition
| The debris left in space after a supernova |
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Definition
| 1.4 neutron star and what dwarf |
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Definition
| The sudden brightening of a star that makes it seem to be a new star |
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Definition
| A star made up of degenerate neutron star matter, has a strong magnetic field and is the size of the sun in mass |
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Definition
| a mass that has collapsed to such a small volume that its gravity prevents escape of all things even light |
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Definition
| A source of precisely timed radio bursts, believed to be spinning neutron stars. |
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Definition
| The explanation of a pulsar as a spinning neutron star sweeping beams of electromagnetic radiation around the sky |
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Definition
| the center or point where all matter is concentrated |
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Definition
| The radius to which all the mass of an object needs to be packed into to become a black hole |
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Definition
| The boundary in a black hole where nothing can escape |
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Definition
| The slowing of clocks or time in strong gravitational fields |
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Term
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Definition
| A large system of stars, star clusters, gas, dust, and nebulae orbiting a common center of mass |
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Term
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Definition
| E0-E7 no gas dust, hot bright stars seen |
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Term
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Definition
SA, SB, SC
dust, gas and hot blue young stars seen |
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Term
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Definition
| bar structure in the neucleus (milky way) |
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Term
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Definition
| has a nucleus but no spiral, no gas or dust is visible either |
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Term
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Definition
| All remaining unclassified galaxies |
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Term
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Definition
| a unit of distance=1 million pc |
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Definition
| the amount by which you look into the past when you look at a distant galaxy time=distance to galaxy in ly |
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Term
| Hubble Law and importance |
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Definition
The linear relation between the distances to galaxies and their velocity of recession
it is proof the galaxy is expanding and we can therefore determine the distance to galaxies |
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Term
| How can a type Ia supernova be used to determine distances to galaxies |
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Definition
They all reach the same absolute mag. -17
Find apparent mag. and then you can get the distance |
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Term
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Definition
| The study of large scale structure and the evolution of the universe |
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Definition
| If you look in any direction you line of sight will eventually fall onto a star |
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Definition
| Theory of origin of the universe at high density and high temperature |
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Definition
| Electrons connect with protons and lets light travel 3,000K |
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Definition
| Period after the big bang before stars ignited after recombination |
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Definition
| The stage in the early history of the universe when ultra violet photons from the first stars ionized the gas filling space |
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Definition
the universe is uniform on the large scale
that it IS |
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Definition
The universe looks the same in any direction
That it LOOKS |
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Definition
| any observer in the universe sees the same thing |
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Definition
| A finite sphere with no boundary |
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Definition
| an infinite saddle with no boundary |
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Definition
an infinite with no boundaries
what our universe actually is |
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Definition
| The average density of the universe needed to make it flat |
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Definition
| Non luminous matter that is detected only by its gravitational influence |
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Definition
| The hypothesis that the planets formed from the same cloud of gas ad dust that formed the sun |
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Definition
small dense rocky little to no atmosphere
(inner planets)
mercury, Venus, mars, earth |
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Definition
large low density thick atmosphere liquid interior (outer planets)
Saturn, Uranus, Neptune, Jupiter |
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Definition
| Small rocky world mostly between mars and jupiter in the asteroid belt |
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Definition
| A small bit of matter heated by friction to incandescent vapor as it falls into Earth's Atmosphere |
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Definition
| A Meteor that survives its passage through the atmosphere and strikes the ground |
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Definition
| A meteor in space before it enters earths atmosphere |
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Definition
| On of the small icy bodies that orbit the sun and produce tails of gas and dust when they approach the sun |
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Definition
| a planet orbiting a star other than the sun |
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