Earth and space 1

A galaxy is

• a large collection of thousands of stars

• a large collection of millions of stars

• a solar system

A star is a

• luminous object as it produces its own light

• a luminous object as it does not produce its own light

• a non luminous object

The life of a star has 4 stages

• formation, death

• formation, nebula, white dwarf

• formation, stable, red dwarf, white dwarf

Stars are formed where

• in a nebula

• in a solar system

• in a black hole

In stable stage stars, nuclear fusion is

• methane burning to produce lots of heat

• hydrogen atoms fusing to produce helium and huge amounts of heat

• helium aroms fusing to produce hydrogen and huge amounts of heat

A white dwarf is formed

• when all the helium has been used and the star shrinks

• when all the hydrogen has been used and the star expands

• when all the methane has been used and the star explodes

What are comets?

• large structures of frozen gas, rocks and dust that stay in the Oort cloud

• large structures of frozen gas, rocks and dust that orbit the sun

• large structures of frozen gas, rocks and dust that orbit the moon

Short term comets come from

• the Oort cloud

• the Asteroid belt

• the Kuiper belt

Halley's comet is a short term comet visible every

• 200 years

• 74 - 79 years

• 500 years

Where is the asteroid belt?

• between Venus and Earth

• between Earth and Mars

• between Mars and Jupiter