October 27 – Close Encounters Of The Worst Kind

Today’s factismal: Earth had at least 44 close encounters with an asteroid in this month alone!

It is, no fooling, a dangerous universe out there. There are gamma ray bursts and black holes and even some strange life forms out there. But perhaps the most amazing thing about the universe is how many close encounters the Earth has considering that space is mostly empty space. In the last month alone, NASA has recorded some 27 things that passed near enough to our orbit to be interesting (without the “Oh God, Oh God, we’re all going to die” part). NASA prefers to call these things “objects” because while most of them are just hunks of space rock heading for a fatal collision, some of them are actually bits of space junk headed back home.

A meteor enters the Earth's atmosphere, as seen from the ISS (Image courtesy NASA)

A meteor enters the Earth’s atmosphere, as seen from the ISS
(Image courtesy NASA)

And, of course, if we expand our definition of “asteroid” to include the bits of rock and dust and ice left in a comet’s wake, then there have been literally millions of “close encounters of the worst kind” in the past month. That’s because every day, more than 80,000 pounds of space debris hit the Earth’s atmosphere! If you look up at night, you’ll see those bits of rock and ice and dust; we call them meteors or shooting stars; if they are very big and very bright, then we call them “fireballs”.

The Great Daylight Fireball of 1972 (Image courtesy and copyright James M. Baker)

The Great Daylight Fireball of 1972 (Image courtesy and copyright James M. Baker)

Now those bits of debris are more than just pretty; they also tell us a lot about how the Solar System and the Earth formed. by keeping track of where they come from and how many there are, scientists can answer questions such as “Where are the comets?” and “How many asteroids hit the Earth?” and “Did an impact really kill off the dinosaurs?” But scientists can’t spend all of their time looking up at the sky; they’ve got data to work on and papers to write and blinking to do. So what are they to do?

Why, they’ll just ask for help. And that means asking you to spend some time looking at the sky each night. If you see a meteor, then just click on the NASA Meteor Counter app; the data you create will automatically be sent to NASA to help in their work! The app is available for free on iTunes and Google Play:
http://science.nasa.gov/science-news/science-at-nasa/2011/13dec_meteorcounter/

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