More on astronomy: Are mysterious temperature patterns on Neptune signs a GoT-style winter is coming? But at the head of every comet is a ball of ice and dust. When observed, comets have a characteristic tail, sometimes stretching millions of kilometres, made of ice and gas. They are now thought to exist in the hypothesised Oort Cloud – a vast reservoir of comets flung billions of kilometres beyond the farthest planets encircling the Sun. ![]() This time.Ĭomets are the icy remnants of the period of planet formation in the early solar system. ![]() This comet will only get as close as 1.6 billion kilometres from the Sun in 2031, so we’re in no danger. But don’t lock yourselves away in your bunkers just yet. And it’s the largest comet ever observed, weighing in at 500 trillion tonnes. Earthly comparison hints at shallow liquid water on Jupiter’s moonĪstronomers have detected a comet hurtling toward Earth at around 10 kilometres a second.Exoplanets dodge bombardment in their infancy. ![]() Astronomers find signs of first intergalactic exoplanet.
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