Space
4 checked facts in this niche — each with its receipts.
Earth continuously loses hydrogen and helium from its upper atmosphere to space through atmospheric escape, and this has been happening throughout its history.
There are more trees on Earth — roughly 3 trillion — than there are stars in the Milky Way, which NASA estimates at 100 to 400 billion.
Saturn is the only planet in the solar system less dense than water: its average density is about 0.69 grams per cubic centimetre, so given a big enough ocean, Saturn would float.
A day on Venus (one full rotation on its axis) takes about 243 Earth days, which is longer than Venus's own year of about 225 Earth days, meaning a Venusian day is longer than a Venusian year.
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