space environment and its challenger in 1000 words
Answers
Explanation:
The fastest thing humans have ever built is a probe called Helios 2. It’s dead now, but if sound traveled in space, you’d hear it screaming as it whips around the sun at speeds of more than 157,000 miles per hour. That’s almost 100 times faster than a bullet, but even at that velocity it would take some 19,000 years to reach Earth’s first stellar neighbor, Alpha Centauri. It’d be a multigenerational ship, and nobody dreams of going to space because it’s a nice place to die of old age.
To beat the clock, you need power—and lots of it. Maybe you could mine Jupiter for enough helium-3 to fuel nuclear fusion—after you’ve figured out fusion engines. Matter-antimatter annihilation is more scalable, but smashing those pugilistic particles together is dangerous. “You’d never want to do that on Earth,” says Les Johnson, technical assistant for NASA’s Advanced Concepts Office, which works on crazy starship ideas. “You do that in deep space, so if you have an accident, you don’t destroy a continent.” Too intense? How about solar power? All you’d need is a sail the size of Texas