Astronomy Yr10

A group of billions of stars and other mass held together by gravity is known as

• Solar System

• Galaxy

• Constellation

• Sun

What is a "light year?"

• a distance of about 6 trillion miles (9.8 trillion km)

• the distance traveled by the speed of light in 1 year

• the time traveled by the speed of light in 1 year

• a distance of about 6 billion miles (9.8 billion km)

Why do astronomers use light years as a measurement?

• because miles & kilometers are sufficient

• it's an easier way to describe huge distances

• it's an easier way to describe large objects such as stars

• because distances in space are extremely vast

What is the name of our galaxy?

• Local Group
• Orion
• Andromeda
• Milky Way

Which two element make up most of the sun?

• helium and hydrogen

• ammonia and methane

• hydrogen and oxygen

• oxygen and helium

What does a super massive star end up as at the end of its life?

• black hole

• red giant

• blue giant

• supernova

What is the process that occurs in the core of a star, like the sun, that produces energy?

• fission
• fusion
• decay
• convection

Galaxies are composed of (best answer)

• stars

• stars and gas

• stars, dust, and gas

• stars, dust, planets and gas held together by gravity

What type of type of star is the our sun

• Dwarf star

• Main sequence star

• Giant star

• Super giant Star

Which numbered stage represents a protostar

• 1

• 2

• 3

• 4