After The Big Bang, the force of _______________ brought particles together to form matter.

_______________ discovered that the universe is continuously expanding.

The Hubble Telescope was launched into space in 1990.

A ____________ galaxy is a collection of millions of stars, along with gas & dust, all held together by gravity.

Earth is in the Milky Way galaxy.

Mercury is the closest planet to the sun.

Pluto is known as a 'dwarf' planet

_______________ is a force a planet & other bodies have that pull objects towards their centres.

The greater the __________ the greater the gravity.