Deflecting asteroids headed for Earth this week on planetary radio. Hello everyone and welcome to Public Radio's travel show that takes you to the final frontier.

I'm Mad Kaplan. We know they're out there.

We haven't found the one headed our way, but it's just a matter of time before we do.

And then what? We'll hear from a group that is making plans right now that may one day save the planet.

Later, Bruce Betts will tell us where to look for all five of the other planets you can see without a telescope in this week's What's Up segment.

Here are some space headlines to get us started.

Out there well past the asteroid belt, Cassini Huygens,

has once again made a run at Saturn's moon Titan, this time passing just

1200 kilometers above the surface of the Hayes obscured body. Observations of

at least one other moon are also planned.

NASA has decided the teamwork will further at least one other moon are also planned.

NASA has decided the teamwork will further the search for

extra solar planets.

The new partners are the venerable Hubble Space Telescope

and the much newer infrared Spitzer telescope that has joined Hubble in Earth orbit.

The instruments are studying the belts of gas and dust surrounding young stars,

from which planets are probably formed.

You can check out the images at planetary.org.

And Space Shuttle Discovery has reached a big milestone in its long trek back to space.

The craft's main engines have been

successfully installed, keeping it on track for a planned return to flight mission in

May of 2005. I'll be back in a minute with Apollo astronaut Rusty Schweichert, chairman of the B-612

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