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This is CBS. I'm the world. I'm John Bachelord. Bob Zimmerman is here. He's taking us toward the sun, toward Venus, inside Venus. What have you discovered, Bob?

Well, I haven't discovered it, but an astronomer using

ground-based telescopes has discovered only the second asteroid ever found that circles the sun

within the orbit of Venus. It's very hard to find asteroids that are closer to the sun than the Earth because the sun's glare makes it hard to look.

And so we haven't found many, and it's not clear how many there would be.

And of course, there's an issue because if there are big ones down there out of sight, they could be a threat to us.

And we don't know they're there.

Well, this is the second one discovered.

It's about a half mile across.

Its orbit takes it just beyond the orbit of Venus at its farthest point from the sun.

The models about asteroids in it closer to the sun than Venus says there won't be a lot of them,

because the sun's radiation

and light will act to drive them away or make their orbits unstable so they'll fall into the

...