A Quote by Neil deGrasse Tyson
There are thousands of asteroids whose orbit in the Solar System crosses that of Earth. And we have a little acronym for them - NEOs: near Earth objects. And our biggest goal is to try to catalogue them, so we know in advance if one is going to put us at risk.
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The hazards posed by Near-Earth Asteroids are assessed by Sentry, a computer system developed by the Near-Earth Objects Group at NASA's Jet Propulsion Laboratory in Pasadena, Calif. The software factors together a cosmic rock's coordinates, distance, velocity, and gravitational influences to calculate its trajectory.
Changing the asteroid's velocity changes the time when the asteroid crosses Earth's orbit. After all, just because it crosses Earth's path doesn't mean there is necessarily going to be a collision. It has to cross Earth's path when the Earth is right there.
Small bodies in our solar system, like comets and asteroids, help us understand how the solar system formed and provide opportunities to advance exploration.
Luckily, there are some rocks left over from our earliest days, asteroids formed during our solar system's birth. Occasionally, some of them drop in on Earth, and when they do, they're called meteorites.
I'm extraordinarily passionate about the idea of asteroid mining in the future. Asteroids out there, we know them from those that have fallen on the Earth, there is a class of asteroids, sub-class of nickel/iron asteroids, which are 50,000 times more enriched than Platinum mines on earth.
It is time to declare that the goal of the United States in space is the settlement of the solar system, from low Earth orbit to the Moon and Mars.
Venus and Mars are our next of kin: they are the two most Earth-like planets that we know about. They're the only two other very Earth-like planets in our solar system, meaning they orbit close to the sun; they have rocky surfaces and thin atmospheres.
The nice thing about asteroids is that once you've found them, and once you have a good solid orbit on them, you can predict a hundred years ahead of time whether there is a likelihood of an impact with Earth.
Once you get to earth orbit, you're halfway to anywhere in the solar system.
Most Jupiter-sized planets orbit the mother star in a highly elliptical orbit. This means they will often cross the orbit of any Earth-like planet and fling it into outer space, making life impossible. But our Jupiter travels in a near-perfect circular orbit, preventing a collision with any Earth-like planet, making life possible.
Hubble wasn't designed to look at objects in our solar system, but after it was launched, astronomers realized that with just a little bit of modification to the software, it could look at solar system objects.
Discovering that our solar system has many more planets than we ever expected, and that most of them are ice dwarfs rather than like Earth and the other rocky terrestrials, is just another step in the revolution in viewpoint that removed the Earth from the center of the physical universe and makes Earth all the more special.
When we build our own colonies, we can do them in near-Earth vicinity, because people are going to want to come back to Earth. Very few people - for a long time, anyway - are going to want to abandon Earth altogether.
Some asteroids have us in their sights. Be nice to sort of go near them and find out what they're made of, possibly tag their ears so they're always broadcasting to us their location. In case one of their trajectories head straight for us, we'll know well in advance to do something about it.
Titan is the one place in our solar system whose geographical and atmospheric diversity and complexity are rivaled only by the Earth's. It's very Earth-like, but it's also very different, which means we have a lot to learn as well as a prayer of understanding what we find.
On the whole, asteroids tend to leave Earth alone. And day to day, there really isn't cause for most people to give them any thought. But despite being remote objects that most people have never seen, asteroids, and the threat they pose, come up an awful lot in popular culture.
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