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...solar system because of collisions with other comets in the Kuiper belt, a major comet belt found beyond Neptune. The annual Perseids and Leonids meteor showers are produced by the Earth encountering the dusty debris left behind from comets Swift-Tuttle and Tempel-Tuttle.When space dust falls to Earth, depending on its size and abundance, it can produce a meteor shower...

...solar system formed...[Oxygen found on comet 67P by the ESA's Rosetta spacecraft] Scientists are perplexed by the detection of molecular oxygen in comet 67P's tail - a completely unexpected discovery. Discovery of molecular oxygen in comet tail forces rethink on how the solar system formed Scientists have for the first time detected molecular oxygen (O2) in a comet’s...

...solar particles, forming the solar wind, which are expelled by the sun and are lower energy but much more numerous. The third source consists of trapped particles, which form invisible belts around planets with a strong enough magnetic field, such as that of the Earth. These last two sources fluctuate with solar activity, which follows an 11-year cycle. The effects of the...

...energy and gravity...[12 things to know about Einstein's theories of relativity] Source: SPACE.com: All about our solar system, outer space and exploration. This infographic was created by Space.com. Read more about 100 years of Einstein's Theory of General Relativity on their website. 12 Things to Know About Relativity Einstein’s theories of relativity revolutionised...