Our Universe Test Review 22-23

How old is the Universe?

• 10 Billion Years

• 14 Billion Years

• 18 Billion Years

• 20 Billion Years

What is an interstellar accumulation of gas and debris where we believe baby stars are born?

• Nebula

• Protostars

• Galaxies

• Coma cluster

The measurement of a star's brightness is called - 

• Magnitude

• Galactic brightness

• Temperature

• Shininess

Galaxy NGC 292 has a velocity of 432 km/s. Using 70 km/s/Mpc as Hubble's constant, how far away is the galaxy according to Hubble's law? 

• 30,240

• 6.17

• 0.16

• 18.2

Answer explanation

V = Hd so...

70 = H

432 = V

? = D

432/70 = 6.17

What keeps planets in the solar system orbiting in elliptical patterns around the sun?

• Kinetic energy

• Potential energy

• Inertia

• Gravity

A system of billions of stars, gas, and dust held together by gravity. ​ ​ ​ (a)  

• Galaxy
• Star
• Nebula
• Universe

A giant ball of burning gases that gives off light. ​ (a)  

• Star
• Nebula
• Galaxy
• Universe

All existing matter and space considered as a whole. It consists of stars, dust, galaxies, and gas held together by gravity.​ (a)  

• Universe
• Star
• Nebula
• Galaxy

What is the name of the scientific theory that explains how the universe was created?

• The Balloon Theory

• The Big Bang Theory

• The Small Bang Theory

What color of star has the hottest temperature?

• red

• orange

• blue