Stars and The Solar System

Question 1

Why do red giants expand?

Accepted Answer

A decrease in gravity

Question 2

What is a spinning white dwarf that emits radio waves?

Accepted Answer

Pulsar

Question 3

What are 90% of all stars in our galaxy, including the sun?

Accepted Answer

a main sequence star

Question 4

Why do nebulas contract?

Accepted Answer

An increase in gravity

Question 5

What do the MOST MASSIVE stars become when they die?

Accepted Answer

Black Holes

Question 6

In the life cycle of a star, what is next after nebula?

Accepted Answer

Protostar

Question 7

In which category do most stars belong?

Accepted Answer

the main sequence category

Question 8

What is the closest star to Earth?

Accepted Answer

Sun

Question 9

How does a star generate energy?

Accepted Answer

fusion

Question 10

What is color of the hottest stars that astronomer's observe?

Accepted Answer

blue

Question 11

Gravity keeps planets from _________

Accepted Answer

flying off into space

Question 12

What is the Hertzsprung-Russell Diagram?

Accepted Answer

the tool we use to study stars

Question 13

When fusion begins, what kind of star is formed?

Accepted Answer

Main Sequence

Question 14

What do SMALL-MEDIUM stars become when they die?

Accepted Answer

White Dwarfs

Question 15

What do LARGE (not the biggest) stars become when they die?

Accepted Answer

Neutron Stars

Question 16

What is the estimated surface temperature of a star based on?

Accepted Answer

the star's color

Question 17

Stars produce energy by fusing hydrogen into what?

Accepted Answer

Helium

Question 18

Compared to planets farther away from the sun, planets closer take _____ time to orbit the sun.

Accepted Answer

less

Question 19

What is the shape of the orbits of planets?

Accepted Answer

elliptical

Question 20

How are the stars organized on the HR diagram?

Accepted Answer

brightness and temperature

Questions 20