What year will Earth be uninhabitable?

This is expected to occur between 1.5 and 4.5 billion years from now. A high obliquity would probably result in dramatic changes in the climate and may destroy the planet's habitability.

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Could you walk on Mars without a spacesuit?

Mars is perhaps the only other potentially-habitable planet in our solar system, but you still couldn't live there without a space suit. Upon stepping on Mars' surface, you could probably survive for around two minutes before your organs ruptured. Can you walk on Venus? Walking on Venu. Venus is very similar to Earth in terms of size, so walking on this planet would feel very similar to walking here. The surface of Venus has mostly red, orange, and brown tones that go really well with its extremely high temperatures.

Accordingly, what if the moon fell to earth?

With the Moon coming closer, Earth's rotation would speed up. Our days would become shorter and shorter. Global temperatures would go down, nobody would worry about climate change anymore. Unless asteroids burned the Earth to a crisp. Can the Earth survive without the Moon? Without the moon, a day on earth would only last six to twelve hours. There could be more than a thousand days in one year! That's because the Earth's rotation slows down over time thanks to the gravitational force -- or pull of the moon -- and without it, days would go by in a blink.

Also, will the moon ever collide with earth?

Short answer: Technically it's possible that the Earth and Moon could collide in the very distant future, but it's very unlikely. It's certainly not going to happen while any of us are alive. Long answer: The Moon is in a stable orbit around Earth. Keeping this in consideration, how long will humans last? Humanity has a 95% probability of being extinct in 7,800,000 years, according to J. Richard Gott's formulation of the controversial Doomsday argument, which argues that we have probably already lived through half the duration of human history.