Pp Space Objects
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- Pages: 20
Objects in Space
Shooting stars – grains of dust travelling at about 70 km/s that burn up in the atmosphere
Meteorite heated by friction with the air
Iron meteorite
What would happen if a large meteorite hit the sea at 70 km/s …
… or if it hit the land as a meteor crater
Moons orbit planets
Craters show where past collisions took place
Planets orbit stars (to scale but the distances are far too small)
Pluto is no longer considered a planet as it’s orbit is different to the others
The Sun give out radiation as 4 million tons of Hydrogen is fused into Helium every second
A blue star Very large and hot using up its fuel very fast
A Red Giant - cooler and bigger as a star dies
Size comparison >
A nebula – the remains of an exploding star
Small and extremely hot but with no fuel left
Small and cold after a white dwarf cools
A galaxy of about 100 billion stars slowly orbiting the centre
Two galaxies in collision
Comets follow elliptical orbits so are only near the Sun for a short time
The tail points away from the Sun
Stars made of only neutrons packed together with a gravity maybe 1000x that of Earth
Black hole with gravity so strong that not even light can escape
Our best picture of the whole Universe
Strands of galaxy clusters with huge dark voids
Shooting stars – grains of dust travelling at about 70 km/s that burn up in the atmosphere
Meteorite heated by friction with the air
Iron meteorite
What would happen if a large meteorite hit the sea at 70 km/s …
… or if it hit the land as a meteor crater
Moons orbit planets
Craters show where past collisions took place
Planets orbit stars (to scale but the distances are far too small)
Pluto is no longer considered a planet as it’s orbit is different to the others
The Sun give out radiation as 4 million tons of Hydrogen is fused into Helium every second
A blue star Very large and hot using up its fuel very fast
A Red Giant - cooler and bigger as a star dies
Size comparison >
A nebula – the remains of an exploding star
Small and extremely hot but with no fuel left
Small and cold after a white dwarf cools
A galaxy of about 100 billion stars slowly orbiting the centre
Two galaxies in collision
Comets follow elliptical orbits so are only near the Sun for a short time
The tail points away from the Sun
Stars made of only neutrons packed together with a gravity maybe 1000x that of Earth
Black hole with gravity so strong that not even light can escape
Our best picture of the whole Universe
Strands of galaxy clusters with huge dark voids
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