Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
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From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
22
MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
18
In 1859, the largest known geomagnetic storm struck the Caribbean, causing an aurora and telegraphs could even operate without a power source.
25
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
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