ASTROPHYSICS

Question 1

DEFINE UNIVERSE

Answer 1

A large collection of billions of galaxies

Question 2

DEFINE GALAXY

Answer 2

A large collection of billions of stars

Question 3

Gravitational force

Answer 3

Between any two objects, there is always a force of attraction, due to the masses of the objects

Question 4

What are comets

Answer 4

Large, rock-like pieces of ice that orbit the sun that have a very elliptical orbit,

Question 5

How are stars classified

Answer 5

O, B, A, F, G, K , M
Blue—white (A) —-> red
Hottest———>coolest

Question 6

Star life cycle of a smaller-mass star

Answer 6

1)nebula (collection of dust and rocks)
2) protostar
3) main sequence star
4) red giant
5) planetary nebula
6) white dwarf

Question 7

Star life cycle of a large-mass star

Answer 7

1) nebula
2) protostar
3) main sequence star
4) red super giant
5) supernova
6) neutron star or black hole

Question 8

APPARENT MAGNITUDE: definition

Answer 8

The perceived brightness of a star as seen on earth

Question 9

LUMINOSITY: definition

Answer 9

The total amount of light energy emitted by a star

Question 10

ABOLUTE MAGNITUDE: definition

Answer 10

A measure of how bright stars would appear if all placed the same distance away from the earth (10 parsecs away from earth)