Joe Palca

On the top of Hawaii's Mauna Kea mountain Thursday, astronomers will point the large Subaru Telescope toward a patch of sky near the constellation of Orion, looking for an extremely faint object moving slowly through space.

If they find what they're looking for, it will be one of the most important astronomical discoveries in more than a century: a new planet in our solar system.

Scientists in Ireland are using a rather unexpected material to make an extremely sensitive pressure detector: Silly Putty.

The Irish researchers combined the kids' plaything with a special form of carbon, and came up with a remarkable new material — one they think could someday be useful in making medical devices.

The next generation of great space telescopes is heading into its final round of ground tests. The nearly $9 billion James Webb Space Telescope will replace the aging Hubble Space Telescope. It's designed to provide unprecedented images of the earliest stars and galaxies that formed in the universe.

But before the telescope can get to work, there are still a lot of engineering challenges to overcome.

Scientists in Michigan have found a new dwarf planet in our solar system.

It's about 330 miles across and some 8.5 billion miles from the sun. It takes 1,100 years to complete one orbit.

But one of the most interesting things about the new object, known for the time being as 2014 UZ224, is the way astronomers found it.

Most of us have been tempted at one time or another by the lure of sugar. Think of all the cakes and cookies you consume between Thanksgiving and Christmastime!

But why are some people unable to resist that second cupcake or slice of pie? That's the question driving the research of Monica Dus, a molecular biologist at the University of Michigan. She wants to understand how excess sugar leads to obesity by understanding the effect of sugar on the brain.