questions for revision Flashcards
1
Q
the cosmological principle
A
the universe is isotropic and homogeneous
2
Q
what is a white dwarf
A
core star left behind after a red giant
3
Q
how to work out arc second from light years
A
multiple light year n_o by constant to then divide by parsec constant
4
Q
intensity
A
power per unit area
5
Q
luminosity of a star?
A
total energy a star emits per second
6
Q
what is parallax angle of 1 second?
A
1/3600 of a degree
7
Q
red shift
A
the apparent increase in wavelength of em radiation caused when source is moving away
8
Q
Big Bang theory
A
states that universe was created from a single point where all the universes mass was situated
9
Q
evidence for Big Bang theory
A
- microwave background radiation
- galaxies are receding from each other
