About Difference between comet and asteroid
Is sort of an insurance program. You want to know what's out there, and if there's something threatening out there. Twenty years ago, maybe we should have been losing sleep, but we didn't know it."Twenty years from now, will near-Earth asteroids still be perceived as potential killers — or will they instead be seen as opportunities to make a killing? Some boosters say asteroid mining could eventually generate a trillion dollars' worth of economic activity annually. Two sets of entrepreneurs are working on ventures aimed at laying claim to asteroids that could provide water, oxygen, construction materials and fuel for space-based operations, as well as precious metals that could be brought back to Earth. One venture, Planetary Resources, started up less than a year ago. The other, Deep Space Industries, was unveiled just this week. Yeomans thinks it's great that investors are willing to put their money into space technologies, but he doubts they'll see a profit anytime soon."I don't understand their business model," he said. "What if you were to ask Colonial Americans to invest in the airline industry? Sure, the airline industry is coming, and it's great, but would you invest the Colonial equivalent of your 401(k) in it?"In his book, Yeomans says the biggest reason to invest in the asteroid search now is to make sure we survive long enough to reap the longer-term payoffs:"Near-Earth objects may one day be the fueling stations and watering holes for interplanetary exploration," he writes. "Ironically, the easiest ones to reach and mine are also those that are most likely to one day collide with Earth and perhaps disrupt or destroy our fragile civilization. We need to find them early and track them to ensure than none among them has our name on it. While these objects are critically important to our future, if we don't find them before they find us, we may not even have a future."Update for 11 p.m. ET: I mused in a Twitter tweet whether it'd be better to face a killer asteroid or a killer comet. If you're musing over the same question, here's an extra bit of data from Yeomans' book: A comet streaking in from the outer solar system would typically have three times the impact velocity of a similarly sized Earth asteroid hitting Earth. When you factor in the density difference, "the comet's impact energy would be about twice that of the asteroid," Yeomans says. Considering that we're likely to have more advance warning about an asteroid, I'd probably go with the asteroid if I had to make a choice. Which would you pick?More about asteroids:Alan Boyle is NBCNews.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook
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Fourth planet from the sun. It is a dusty, cold, desert world with a very thin atmosphere. Iron oxide is prevalent in Mars' surface resulting in its reddish color and its nickname "The Red Planet." Mars' name comes from the Roman god of war." data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]" tabindex="0" role="link">Mars and JupiterJupiter is the largest planet in the solar system and the fifth planet from the sun. It is a gas giant with a mass greater then all of the other planets combined. Its name comes from the Roman god Jupiter." data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]" tabindex="0" role="link">Jupiter called the asteroid belt.Some asteroids are round, some are elongated, and some even have a satellite. A comet also orbits the Sun, but unlike an asteroid, it’s composed of ice and dust. So, when a comet gets close to the Sun, its ice and dust content start to vaporize. So, when seen in a telescope, a comet appears fuzzy and/or has a tail.So, what’s a meteor? Well, let’s start with a meteoroid. A meteoroid is a small piece of asteroid or a comet, typically pebble-sized, but could be a little smaller or a little larger, and often created from a collision.. When a meteoroid gets close to the Earth and enters the Earth’s atmosphere, it’s called a meteor. And a meteor enters the Earth’s atmosphere at a very high speed. So it burns up and produces a streak of light called a shooting star. So, if you have seen a shooting star, you likely saw a meteor.
