Asteroid Is a Dance Partner for Planet Earth

"Finally tonight, a dance partner for planet Earth. It's called a "Trojan" asteroid, one that shares a planet's orbit circling around the sun. Many such asteroids have been found near other planets. Now, as reported in the journal "Nature," the first has been discovered near the Earth.

We get an explanation from Mike Brown, a planetary astronomer at the California Institute of Technology.

So, tell us a bit more about a "Trojan" asteroid. In this case, it's held in the gravitational pull between the Earth and the sun?" To read more and to view the video, click here.