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15 Cards in this Set

  • Front
  • Back
The presence of what is proof that fusion occurs inside the sun?
What are the two elements involved in the fusion in the sun?
Hydrogen and Helium
How is energy created in the sun?
The fusion between hydrogen and helium. Helium weighs less and the difference is converted into energy.
What is the Solar Neutrino Problem?
Only 1/3 of the electron neutrinos predicted were detected
What is the solution to the solar neutrino problem?
electron neutrinos change into other forms and have mass (dark matter)
What determines a star's initial position on the main sequence?
its mass
Which stars have longer lives: ones with a large mass or ones with a small mass?
ones with a small mass
What is a pulsar?
a pulsar is a rotating neutron star with a strong magnetism
what are three characteristics of Quasars?
1) high redshifts, 2) very far away, 3) very luminous
Where does time run slower: near a mass, or far from a mass?
time runs slower near a mass.
What are the four reasons for using IR astronomy?
1) to see through dust 2) to see cool objects 3) to measure temperatures of cool blackbodies 4) to look far back in time.
What is the Schwarzschild radius?
the radius of the event horizon of a black hole
What 2 things did Hewish discover that pulsars prove?
1) neutron stars exist 2) type IIs make neutron stars
What are 6 characteristics of elliptical orbits?
1) they are not discs (spheroidal) 2)there is little rotation 3) there is no gas or dust 4) only old stars 5) they are reddish 6)no type II supernovas
What are quasars (probably)?
supermassive black holes with a lot of mass falling towards them