vocab

Question 1

How bright an object appears from Earth.

Answer 1

Apparent Magnitude

Question 2

The average distance between Earth and the Sun, about 150 million km.

Answer 2

Astronomical Unit

Question 3

The universe began from one point billions of years ago and has been expanding ever since.

Answer 3

Big Bang Theory

Question 4

An object whose gravity is so great that no light can escape.

Answer 4

Black Hole

Question 5

The orange-red layer above the photosphere.

Answer 5

Chromosphere

Question 6

Where hot gas moves up toward the surface and cooler gas moves deeper into the interior.

Answer 6

Convection Zone

Question 7

The wide, outermost layer of a stars atmosphere.

Answer 7

Corona

Question 8

Matter that emits no light at any wavelength.

Answer 8

Dark Matter

Question 9

The shift to a different wavelength.

Answer 9

Doppler Shift

Question 10

Huge collection of stars.

Answer 10

Galaxy

Question 11

A graph that plots luminosity v. temperature of stars.

Answer 11

Hertzspring-Russel Diagram

Question 12

The distance light travels in a year.

Answer 12

Light-year

Question 13

The true brightness of an object.

Answer 13

Luminosity

Question 14

A cloud of gas and dust.

Answer 14

Nebula

Question 15

A dense core of neutrons that remains after a supernova.

Answer 15

Neutron Star

Question 16

A process that occurs when the nuclei of several atoms combine into one large nucleus.

Answer 16

Fusion

Question 17

The apparent surface of a star.

Answer 17

Photosphere

Question 18

A shell of cooler hydrogen above a stars core.

Answer 18

Radioactive Zone

Question 19

Spreads light into different wave lengths.

Answer 19

Spectroscope

Question 20

A large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.

Answer 20

Star

Question 21

An enormous explosion that destroys a star.

Answer 21

Supernova

Question 22

A hot, dense, slowly cooling sphere of carbon.

Answer 22

White Dwarf