Unit 7 Review

A Group of stars, and or star systems, star clusters, dust and gas held together by gravity is known as:

• Universe

• Galaxy

• Solar System

• Planet

How many star that are visible in the sky are closer to Earth than the Sun?

• only one

• none of them

• all of them

• about half

With the use of the Hubble Telescope, scientists recently discovered a giant runaway star. It is 90 times bigger than the sun and is not very hot and red in color. It is also a very bright star, how come from Earth it does not seem as bright as the sun?

• the sun is different color than the runaway star

• the sun is older than the runaway star

• the sun is closer to earth than the runaway star

• the sun is made of different elements than the runaway star

Where would our Sun be located in the Milky Way?

• A

• B

• C

As a whole, Giants are considered hotter than White Dwarfs.

• True
• False

Look at the H-R diagram. Which star is
sort of cool, dim (not too much light), and red?

• Betelguse
• Sirius B
• Procyon B
• Barnard's star

Which star has the lowest temperature?

• A
• B
• C
• D

Which spectral class does our star, the sun, belong to?

• M
• K
• G
• F

The luminosity of a star describes its ______________.

• brightness

• temperature

• age

• color

What stage fills in the blank. Nebula --> Main sequence --> red giant --> ______________ --> white dwarf --> black dwaft

• supergiant
• planetary nebula
• black hole
• supernova