Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
The presence of what is proof that fusion occurs inside the sun?
|
Neutrinos
|
|
|
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
|
