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How was our Sun formed?
The Sun formed about 4.5 billion years ago when a cloud of gas and dust (a nebula) was pulled together by gravitational attraction.
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The particles in the cloud got faster and collided more. The gas warmed up and eventually became hot
The particles in the cloud got faster and collided more. The gas warmed up and eventually became hot enough to glow. This was a protostar.
As the protostar gets more dense, more collisions take place and it gets hotter. Eventually the cloud gets
hot enough for hydrogen atoms to fuse, forming helium. We call a star in this state a main sequence star.
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How do we decide if something is a
planet, moon or satellite?
A planet orbits a star, enough gravity to make it spherical and sweeps out its own orbital path of other
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A satellite is something that orbits something else. The Moon is a natural satellite. There are many
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What is red-shift?
Light waves are stretched out if a star or galaxy is moving away from an observer. The wavelength of the
light increases.This is called red-shift because the light is shifted towards the longer wavelength red end of
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If a star or galaxy was moving towards the observer, the light waves would be compressed making the
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Where is our solar system?Our solar system is in the Milky Way galaxy, a collection of around 100 billion stars.
Why do we have uranium?Uranium and other such heavy elements naturally present on Earth can only be formed in a supernova explosion so the Sun must have formed from the remnants of a supernova.
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