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a half of a mile (0.8 kilometer). What is considered a ...
Will Earth be swallowed by a black hole? Absolutely not. While a black hole does have an immense gravitational field, they are only “dangerous” if you get very close to them. … It would get very dark of course and very cold, but the black hole’s gravity at our distance from it would not be a concern.
And without sunlight, the Earth would get very, very cold. Earth’s surface temperature now averages about 57 degrees Fahrenheit, but by the end of the first week without the sun, the average surface temperature would be below the freezing point.
As soon as the last of the sun’s light reached us – eight-and-a-half minutes after the sun itself disappeared – the sun would blink out and night would fall over the entire Earth. Not until that instant would Earth sail off in a straight line into space. … But then the night sky would begin to change.
There would be minor changes in the planets’ orbits about the Sun, but very little else. However, Jupiter does a great job of shepherding and absorbing small objects in the Solar System. With Jupiter gone, the main effect on Earth would be an increase in the rate of impacts from asteroids and other space flotsam.
But if you’re going to try it, you need to know this one small catch. Scientists say humans could indeed enter a black hole to study it. Of course, the human in question couldn’t report their findings—or ever come back.
When you start feeling pain depends on the size of the black hole. … If you’re falling into a stellar black hole, you’ll start feeling uncomfortable within 6,000 kilometers (3,728 miles) of the center, long before you cross the horizon [source: Bunn]. Either way, spaghettification leads to a painful conclusion.
“Exceptionally unlikely.” But for an object to knock the Moon off its orbit, it would have to be “big enough to hit the Moon at the right speed at the right angle,” says Byrne. … So the Moon’s orbit is getting further away from Earth, not closer, and certainly not on a collision course with our planet.
In the best case, the average temperature drops to 32 degrees Fahrenheit in about 400 days, and to zero degrees Fahrenheit in 879 days. These averages, however, include the oceans, and the heat retained there will largely stay there, not doing us much good.
about -455 degrees Fahrenheit
Far outside our solar system and out past the distant reachers of our galaxy—in the vast nothingness of space—the distance between gas and dust particles grows, limiting their ability to transfer heat. Temperatures in these vacuous regions can plummet to about -455 degrees Fahrenheit (2.7 kelvin).Sep 25, 2020