The universe is constantly expanding. The universe consists of stars, planets, moons nebula, pulsars, black holes and space. Our solar system is approximately 5800 000 000 km from the sun to outside. Our solar system is small part of our galaxy, the Milky Way.
The universe is so large, it cannot be measured in kilometres. Instead we use light years. 1 light year = distance light will travel in one year.
Light travels at 3000000km per second.
Evidence suggests that is still expanding. The edge of the universe is approx, 1400 million light years.
The stars and galaxies at the edge are moving faster than those in centre.
Big Crunch- the Big Bang crunch is when dark energy reduces and gravity pulls everything onto it ending the universe .
Big chill- the world freezes over and ends life.
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