Best Astronomy pictures /astroknowledge /spacefacts channel

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The picture below covers a distance of 50 light-years. Each of those dots in the picture above is a star, like our Sun. The distance across our Sun is 864,000 miles, which is 109 times wider than Earth. Think of all that...space. @spacepictureloversspecial

There might be another planet on the rim of our solar system. Some astronomers have found evidence of a ninth planet far beyond Neptune (I'm sorry to those of you who are still sore about the whole "Pluto isn't a planet" thing). Although it has yet to be observed, the astronomers have noticed strange orbital patterns of smaller objects in the Kuiper Belt. @spacepictureloversspecial

have you considered the possibility that we've already sent a message to an alien race in the distant past and it's still making its way to them? Space is huge, we've established that by now, and there's every chance we've already sent a message into space thousands of years ago and forgotten about it (think about how societies change over time). We could either still be waiting for that message to arrive, OR waiting on a reply to travel back to us. In that sense, we would just be constantly introducing ourselves over and over again to whoever else might be out there.... @spacepictureloversspecial

According to quantum mechanics, there's a small chance the entire universe could spontaneously disappear and never come back. This idea is based on a complicated theory known as vacuum decay – basically a self-destruct button for the universe! It's only speculative at this point, but it comes down to whether the universe is in a true or a false vacuum – a true vacuum is stable, but a false vaccum isn't. If a random quantum fluctuation allowed a false vaccum to release its potential energy, it would create a bubble of true vacuum that would expand at the speed of light and delete every single thing it touched. Destruction would be instant and depending on where it happened in the universe, we might never see it coming. Remember, this one is just a theory! @spacepictureloversspecial

Dark Matter is believed to be responsible for 85% of gravity in the universe, and no one knows what it is or how it works. According to Neil deGrasse Tyson, Dark Matter is the longest-standing unsolved mystery in modern astrophysics. Indeed, it might not even be matter! Basically, the amount of gravity in the universe doesn't quite equal the amount of observable mass – the planets, the stars, the galaxies, the comets, the black holes, and the dark clouds. So scientists propose there is a large measure of unobservable or "dark" mass in the universe, which is the source of all that gravity. @spacepictureloversspecial

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There are rogue planets that have been knocked out of orbit just chilling out in the universe, and they could do the same to another planet. These rogue planets do not orbit a star, and so it's pretty hard to glimpse them – in fact we don't actually know if there are any nearby at all. Statistically speaking, however, they are not close enough to be a concern and really we're a pretty small target given the size of the solar system. @spacepictureloversspecial

It's possible for two pieces of the same metal to actually fuse together if they touch in outer space. This is known as "cold welding", and it occurs because the atoms of both individual bits do not know that they belong to different pieces of metal, so they join together. This doesn't happen on Earth because there is always air or water separating the pieces. @spacepictureloversspecial