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The scale above misrepresents the relative size and
distances
If the sun was a football Earth would be the size of a
petit poi and would be 100m away
Our solar system is part of the Milky Way galaxy (a
collection of stars)
There are millions of galaxies in the Universe, some can be
seen using telescopes but most are too far away
Distances in the Universe are measured in light years (the
distance light travels in a year)
Orbits
An orbit is a circular…read more

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If the satellite were to slow down a lot it would fall out of
orbit
When spaceships leave the Earth they have to speed up to
`escape' Earth's gravity ­ this is called escape velocity
Space travel
Why do it? Difficulties involved
Manmade spacecrafts
Discover information S
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Explore K
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Find out what life exists S
elsewhere t
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S
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Page 6

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V
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Unmanned spacecrafts
Send back information R
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Record various things like: T
Magnectic fields e
Temperatures c
Photographs h
Atmoshere n
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