The hustle and bustle of our solar system

July 31, 2012
Credit: NASA/JPL-Caltech

(Phys.org) -- This diagram illustrates the differences between orbits of a typical near-Earth asteroid (blue) and a potentially hazardous asteroid, or PHA (orange). PHAs are a subset of the near-Earth asteroids (NEAs) and have the closest orbits to Earth's orbit, coming within 5 million miles (about 8 million kilometers). They also are large enough to survive passage through Earth's atmosphere and cause damage on a regional, or greater, scale.

Our yellow sun sits at the center of the crowd, while the orbits of the planets Mercury, Venus and Mars are shown in grey. Earth's stands out in green between Venus and Mars. As the diagram indicates, the PHAs tend to have more Earth-like orbits than the rest of the NEAs. The asteroid orbits are simulations of what a typical object's path around the sun might look like.

The dots in the background are based on data from 's NEOWISE, the asteroid-hunting portion of the Wide-field Explorer (WISE) mission, which scanned the whole sky twice in before entering hibernation mode in 2011. The blue and orange dots represent a simulation of the population of near-Earth asteroids and PHAs, respectively, which are larger than 330 feet (100 meters).

NEOWISE has provided the best overall look at the PHA population yet, refining estimates of their numbers, sizes, types of orbits and potential hazards. The NEOWISE team estimates that about 20 to 30 percent of the PHAs thought to exist have actually been discovered as may 2012, the date of this image.

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Jeddy_Mctedder
1 / 5 (1) Jul 31, 2012
http://en.wikiped...Cruithne

my suggestion for the ultimate solar system science experiment of our century.
steering cruithne into mars.
http://www.halfba...o_20mars

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