There's always something unusual and fascinating going on in space. In 2021, the biggest-ever comet we know - 100,000 times bigger than that of an average comet - entered our Solar System. No worries, though, it won't get closer than a billion miles to our beautiful green planet. More than 1,300 Earths could fit inside the gas giant, Jupiter. But a team of astronomers has recently discovered a much, much bigger planet, 9 times as heavy as Jupiter.