Space

• A Moon is a satellite that orbits a planet, and is not a planet itself.
• The Sun is a star that the Earth orbits.
• A Star is a large, hot, luminous body that emits light and heat.
• A Solar System is a collection of planets, moons, asteroids, comets, and other objects that orbit a star.
• A Galaxy is a collection of billions of stars, held together by gravity.
• The Universe is every conceivable thing.
• The Big Bang Theory is the theory that the universe began as a single point of infinite density and temperature.
• Oblers Paradox states that without the Red Shift there would be only light and no darkness in-between stars.
• Red Shift is the shift of the spectral lines of an object towards the red end of the spectrum.
• A satellite orbits at a constant speed, but it takes longer to complete one orbit as its distance from Earth increases