Stars and Galaxies

A star is a big ball of hot gases.

The gases are mostly hydrogen and _______________

Tags

NGSS.HS-ESS1-3

The brightness/colour of star depends on its size and temperature. 
Stars with higher temperature are ______________ colour. Stars with lower temperature
are ________________ colour.

• red, blue

• red, black

• blue, red

• blue, yellow

Astronomers found that there are four main group of stars, namely white dwarf, neutron stars, giants and _______________

Tags

NGSS.HS-ESS1-3

Stars are formed within large clusters of dust and gases.

These cloud of dust and gases are called _____________

• white dwarf

• giant

• nebulae

• core

The formation of a star starts when a nebula is pulled into its core due to the force of ___________________

• motion

• gravity

• attraction

Tags

NGSS.HS-PS2-4

Hydrogen atoms combine to form helium atoms, releasing a large amount of ____________ and ____________ energy.

• kinetic

• potential

• heat

• light

Tags

NGSS.HS-ESS1-1

The lifespan of a star is determined by the original mass of the air. A star with a big mass has a _______________ lifespan compared to a star with a small mass.

• shorter

• longer

Tags

NGSS.HS-ESS1-1

A die star will become either a white dwarf, neutron star or _________________ when its dies, depending on its size

• nebulae

• giant

• black hole

Tags

NGSS.HS-ESS1-3

There are three main types of galaxies, depending on their shape. They can be ___________ , elliptical or irregular

The Milky Way has a _____________ shape and contains about 200 billion stars. Our Sun is one of the stars in the Milky Way.