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" ... And there are a few. Over time, the gravitational effects of the planets tugging on one another will potentially cause our orbits to become chaotic. Although, for instance, the inner planets are all safe for the next billion years, there’s about a ~1% chance that one of the four of us — Mercury, Venus, Earth, or Mars — will become unstable in our Solar System orbits. If that occurs, Earth's orbit could change significantly, possibly even hurling our planet into the Sun or ejecting it from the Solar System entirely. This is the most unpredictable component of our planetary orbit. ... "
" ... On September 14, 2015, our knowledge of the world forever changed with the first direct detection of gravitational waves from merging black holes. Since that event, some ~60 additional gravitational wave signals have been seen, including not only merging black holes, but merging neutron stars as well. The past five years have validated Einstein as never before, proving many of General Relativity’s predictions right. Over the next few years, gravitational waves will have an unprecedented opportunity to put our theory of gravity to the test as never before. Although you should never bet against Einstein, new ways of probing the Universe always have an opportunity to show us that it doesn’t behave how we might have expected. Here’s how gravitational waves might wind up proving Einstein wrong. ... "