Astronomy

This is the best summary I could come up with:

At high accelerations, "your blood will have a hard time pumping to your extremities," said Michael Pravica, a professor of physics at the University of Nevada, Las Vegas.

As the g-force increases, your body's ability to circulate your blood from your feet to your head becomes limited.

Fighter pilots and other people who experience high levels of g-force are taught techniques to keep from passing out, such as tensing muscles in their extremities, and they use special suits to withstand up to 9 g for short periods of time.

Einstein's theory of special relativity shows that as an object with mass gets closer to the speed of light, the mass starts to increase as it nears the speed of light, Pravica said.

But there's a big difference between getting an electron to move that fast and launching a person at that speed, which would require so much energy as to be extremely improbable, even if it didn't break the laws of physics.

If you could move at near light speed, you would experience the effects of relativity on time, Pravica said.

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