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a theory that the earth is at the centre of our solar system.
a theory that our sun is at the centre of our solar system.
a telescope that just uses lenses.
a telescope that uses mirrors and lenses.
the gas and dust between stars.
a large amount of gas coming together because of gravity.
lots of dust and gas that will form more than one planet or sun.
it happens after a nebula. Parts of the clouds collapse because of gravity and it gets hotter.
main sequence star
It happens after a protostar. It is the longest and strongest stage of the stars life.
It happens in smaller stars after main sequence star. The star gets bigger as it runs out of hydrogen or helium.
It happens in bigger stars after main sequence star. The star gets bigger as it runs out of hydrogen or helium.
It happens after red giant. It loses its outer layers and becomes hot and dense.
It happens after white dwarf. It is when it loses its heat and light.
It happens after red supergiant. It is when it loses its outer layers and becomes very bright.
it happens to GIANT stars after supernova. It loses its light but the gravity pulls everything inside it.
it happens to BIG stars after supernova. It becomes very small and bright.
steady state theory
an idea that the universe always existed, is always expanding and creates matter.
big bang theory
an idea that the universe started at one point, is expanding and does not create matter.
it is the colours of the wavelength depending on how long they are.
a sound that is below our hearing. (below 20 Hz)
a sound that is above our hearing.
a point on the surface above where the earthquake is.
the point where the earthquake started. (underground)
a machine that can tell if there is an earthquake.
they are longitudinal and arrive at an earthquake first.
they are transverse and arrive second at an earthquake.
energy of charged particles.
the flow of charged particles.
a way to measure the change in energy.
the same amount going into something as going out.