Of the 300,000 or so Earth-crossing asteroids at least 300 feet across, we know hardly any.    From Wordnik.com.  [THE SCIENCE OF DOOM] Reference

Possibly it does terrify some people, but I've known about Earth-crossing asteroids for some time.    From Wordnik.com.  [2.4 Meters] Reference

But the very fact that an Earth-crossing asteroid may closely approach the Earth gives us additional options.    From Wordnik.com.  [Our First Colonies in Space] Reference

The first Earth-crossing asteroids -- those whose paths around the sun intersect Earth's -- were discovered in 1932.    From Wordnik.com.  [Never Mind!] Reference

However, Alan Harris, senior researcher at the Space Science Institute said the object has a perfectly ordinary Earth-crossing orbit.    From Wordnik.com.  [Asteroid or Space Junk? Object Makes Close Pass by Earth Wednesday | Universe Today] Reference

"As an Earth-crossing asteroid, Itokawa has a reasonably high statistical chance of striking Earth in a million or more years from now, JAXA says.".    From Wordnik.com.  [NASA Watch: Keith Cowing: April 2006 Archives] Reference

Rather, our first choices should be Earth-crossing asteroids, the same asteroids that NASA is cataloging because they pose a potential threat to Earth.    From Wordnik.com.  [Our First Colonies in Space] Reference

Word is that Arecibo's radar system may lose its NSF funding as early as 2008, leaving us without our premier tool for tracking asteroids of the Earth-crossing variety.    From Wordnik.com.  [Posthuman Blues] Reference

The scope's current mission is to locate the estimated 30% of the 1-kilometer-or-larger Earth-crossing asteroids that have yet to be discovered, thus possibly saving civilization.    From Wordnik.com.  [2.4 Meters] Reference

And then you have to make sure that they don't go into an Earth-crossing solar orbit, because that would be even worse than simply having it orbit around up there in the first place!.    From Wordnik.com.  [Space Junk Threatens Future Missions | Universe Today] Reference

Also surprisingly, they found that the most dangerous scenario was an instance in which the test Jupiter had 20% in which the planet “is massive enough to efficiently inject objects to Earth-crossing orbits.”.    From Wordnik.com.  [Jupiter – Our Silent Guardian? | Universe Today] Reference

Even a small Earth-crossing asteroid such as Apophis only 300 meters wide contains fifty million tons of material, potentially including millions of tons of water, iron, carbon, nitrogen and other materials valuable to life in outer space.    From Wordnik.com.  [Our First Colonies in Space] Reference

In the long run, I believe that humanity will view Earth-crossing, potentially hazardous asteroids as low-hanging fruit, and each future discovery of an asteroid on a possible collision path will be followed by a gold-rush style race culminating in another new moon for our planet.    From Wordnik.com.  [Asteroid Capture into Earth Orbit] Reference

Extinction-causing impacts would be extremely rare, because most Earth-crossing asteroids are not that large.    From Wordnik.com.  [The Globe and Mail - Home RSS feed] Reference

"When we find one that is really a close, Earth-crossing asteroid, we can learn about how to deflect it," Price said.    From Wordnik.com.  [KVUE - Home] Reference

"The meteorite was on a typical Earth-crossing asteroid-type orbit, so we also expect that it is a stony-type meteorite," says McCausland.    From Wordnik.com.  [YubaNet.com] Reference

It has been believed that nearly all long-period comets that move inside Jupiter to Earth-crossing trajectories originated in the outer Oort Cloud.    From Wordnik.com.  [innovations-report] Reference

The work also shows that many long-period comets that end up in Earth-crossing orbits likely originate from a region astronomers have long believed could not produce observable comets.    From Wordnik.com.  [The News is NowPublic.com - NowPublic.com: The News is Now Public] Reference

Asteroid strikes that can produce craters on an order of kilometers across are extremely infrequent occurrences; the chance of an asteroid with an Earth-crossing orbit actually striking the planet has been estimated at '' 2.5.    From Wordnik.com.  [Conservapedia - Recent changes [en]] Reference

However, Alan Harris, senior researcher at the Space Science Institute countered by saying the object has a perfectly ordinary Earth-crossing orbit, and that its orbit doesn’t resemble any useful spacecraft trajectory.    From Wordnik.com.  [Images and Videos of 2010 AL30 | Universe Today] Reference

Earth-crossing asteroids and meteoroid streams. "say Y.V. Obrubov," There are ten members in the major complex: two comets, P / Schwassmann-Wachmann 3 and P / Pons-Winnecke; four asteroids, 1984 KD (3671), 4788 PL, 1987 SJ3, 1987 PA … "So where does the stream for the Camelopardalids fit in?.    From Wordnik.com.  [Universe Today] Reference

"perfectly ordinary Earth-crossing orbit".    From Wordnik.com.  [dailyindia.com News Feed] Reference