OortCloud
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A star will graze our solar system in a million years
In just over a million years, Earth inhabitants will get a closer look at a star than they might want. Gliese 710 is currently a safe 64 light years away, but scientists discovered in 1999 that the sun-like star was barreling directly toward us at around 32,000 mph. We've known for awhile that it would closely pass by our solar system, but Polish astronomers have calculated that it could end up a mere 77 light days away. That would easily be close enough to deflect the orbit of asteroids or comets in our solar system's Oort Cloud, potentially toward Earth.
Scientists find a tailless comet from Earth's early days
It's well-established that the many asteroids and comets in the Solar System are the result of its violent early history, but finding an untouched example from the inner system is difficult. However, an astronomy team has discovered just that -- and it might shed a lot of light on our homeworld's early days. Thanks to both Pan-STARRS 1 and the Very Large Telescope, they've spotted a tailless, predominantly rocky comet (C/2014 S3) that has all the telltale signs of a "pristine" asteroid formed in the inner Solar System around the same time as the Earth, roughly 4.5 billion years ago. Its long, 860-year orbit hints that it was kicked towards the Oort Cloud (the system's extremely distant bubble of comets and other icy bodies) in the ancient past and only recently got pulled back toward the Sun.
