Stars and Galaxies Review

What is a black whole

• A dense core of neutrons left from a supernova

• An enormous explosion that destroys a star

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

• A hot, dense, slowly cooling sphere of carbon

A group of stars, gas, and dust held together by gravity is a __

• Constellation

• Galaxy

• Local Group

• Constellation & Galaxy

An astronomical unit is the average distance between Earth and the Sun.

• True

• False

A sequence of star colors from hottest to coolest is _____

• Blue, yellow, orange, red

• Yellow, blue, orange, red

• Red, orange, yellow, blue

• Blue, red, yellow, orange

At the end of a star’s life cycle, it releases gas into space that can be recycled into new stars.What do scientists call the area or cloud of recyclable materials?

• Planetary nebulae

• Supernova remnant

• Protostars

• Planetary nebulae & Supernova remnant

Where do stars form?

• In a supernova

• In a cloud of gas and dust called a nebula

• When existing stars split in half

• In an empty section of space

A measure of the amount of the light given off by a star is its _____.

• Absolute magnitude

• Apparent magnitude

• Position in space

• Size

Dark, cooler areas on the Sun's surface are called _____.

• Sunspots

• Coronas

• Prominences

• Solar flares

The coolest stars in the sky are _____ in color.

• Blue

• Yellow

• White

• Red

Two stars orbit each other in a(n) _____ star system

• Single

• Binary

• Individual

• Closed