Gravitational field strength- is measured in newtons per kilogram. On the earth the field stregnth is 10N/Kg. It varies to that on the moon.
Acceleration of free-fall refers to the greatest acceleration that a mass can achieve when it falls in a gravitational field. Its measured in metres per second per second.
Space is VERY COLD! The temperature depends on the distance from the sun.
Astronauts are exposed to harmful radiation whilst in space. Water is a good shield and scienstist are looking at surround air craft with water tanks.
Every action has an equal and oppisite reaction. - Spacecraft engines rely on this principle.
Escape velocity- when omething is thrown fast to escape the earths pull.
Black hole- smallest and most dense known object.- with an escape velocity of more than speed of light.
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