19,916
edits
Changes
no edit summary
==Key Stage 3==
===Meaning===
A [[Light Year]] is the distance [[light]] can travel in one [[Year|year]] in space.
===About Light Years===
: A [[Light Year]] is a [[distance]].
: [[Scientist]]s use [[Light Year]]s as a [[unit]] for extremely large [[distance]]s.
: A [[Light Year]] is around 9,461,000,000,000,000 [[metre]]s. Since [[star]]s are much further away than this it doesn't make sense to write the [[distance]] in [[metre]]s so [[scientist]]s use the [[Light Year]].
: The next nearest [[star]] to the [[Earth]], after [[The Sun]], is [[Alpha Centauri]] which is 4.23 [[Light Year]]s away.
: Our [[The Solar System|Solar System]] is in a [[galaxy]] called [[The Milky Way]] but the next [[galaxy]], [[Andromeda]] is 2,000,000 [[Light Year]]s away.
==Key Stage 4==
===Meaning===
A [[Light Year]] is the distance [[light]] can travel in one [[Year|year]] in space.