ESRT Review Space Star Classification

How are stars classified?

• Color and temperature

• Temperature and brightness

• Brightness and color

• Temperature and color

The hottest stars are_______.

• white

• blue-white

• red

• blue

What type of galaxy is shown in the picture?

• sprial

• irregular

• elliptical

• barred

Which of the following is the best estimate of the number of stars in a galaxy?

• tens

• thousands

• millions

• billions

Which object in our solar system is a star?

• Moon

• Sun

• Meteor

• Sirius B

What is apparent brightness?

• The measure of how bright a star appears to an observer on Earth.

• How far away a star is from Earth.

• The brightness of a star.

• A measure of how bright the star would be if all stars were the same distance from Earth.

The Hertzsprung-Russell diagram plots the

• Absolute magnitude versus the apparent magnitude.

• Mass versus absolute magnitude.

• Luminosity versus surface temperature.

• Surface temperature versus mass.

Supergiants are ______.

• Very Dim.

• Always 500 times greater than our sun.

• Relatively cool in temperature.

• Very high in temperature.

At the center of most, if not all galaxies is a ________.

• Giant Sun

• Giant Black Hole

• Big bang

• Big sun

What is the correct order of the object in order from smallest to largest?

• Solar system, universe, galaxy.

• Galaxy, universe, solar system.

• Solar system, galaxy, universe.

• Universe, galaxy, and solar system.