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Results tagged “comets” from Breaking Orbit

When it comes to sky shows, sometimes a lunar blessing can be a meteor's curse.

Friday night's biggest, baddest full moon is sure to capture the hearts of many a skywatcher. But it also means this year's Geminid meteor shower, due to peak the night of December 13-14, will be largely washed out by the satellite's shining face.

In recent years the Geminids have become the most active of the annual meteor showers, with peak rates of 110 "falling stars" an hour on record for 1996.

Last year's shower fell during a moonless night, prompting predictions of the "year's best" sky show for 2007.

geminid-sky.jpg

A Geminid meteor as seen from San Francisco on December 14, 2007
—Photo courtesy Mila Zinkova

Not so for 2008. Astronomers predict that during this year's shower only the brightest meteors will cut through the moon's glare, and the folks over at EarthSky are even suggesting would-be skywatchers should skip the frigid December vigil and wait for a clearer view of the Quadrantid shower in early January.

Die-hard fans may get lucky, though, especially if you can get away from city lights and recline in the weekend chill.

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Why's It so Dusty Down Here?

Posted on September 3, 2008 | 0 Comments

Not every meteor that slams into Earth is a dino-killing whopper. Microscopic meteorites also find their way down to the planet's surface on a regular basis, but there's been some debate about where exactly they come from.

In the September 1, 2008, issue of Geology, Mathew Genge of Imperial College London reports that a massive collection of cosmic dust grains found in Antarctic ice originally came from the Koronis asteroids, an ancient family of space rocks in the Main Belt between Mars and Jupiter.

ida-asteroid.jpg

Koronis family asteroid 243 Ida and its moon, Dactyl
—NASA/JPL

The minerals and chemicals inside these itteh-bitteh pieces of asteroid match what scientists had previously found in a small group within the Koronis family called the Karin asteroids. And sure enough, telescope observations of the Karin show those rocks are even now jiggling around and smashing into each other, producing dust.

According to Genge, the discovery means that some level of research into the origins and formation of the solar system can be accomplished without even leaving the ground.

planet-dust.jpg

"Out of the cosmic dust, a planet is born."
—NASA/JPL-Caltech/R. Hurt (SSC)

"The answer to so many important questions, such as why we are here and are we alone in the universe, may well lie inside a cosmic dust particle," Genge said in a university news release.

"Since they are everywhere, even inside our homes, we don't necessarily have to blast off the Earth to find those answers. Perhaps they are already next to you, right here and right now."

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About This Blog

The moon
From dwarf planets to hot Jupiters, join NatGeo News space and tech editor Victoria Jaggard in a global discussion about all things extraterrestrial.


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