None, at least, until somebody should discover an 11th planet.

It was as though my teacher had discovered a new planet in the skies.

I don't think we have the technology to discover planets in other galaxies, yet.

They discovered a strange planet with remarkably similar conditions to earth.

Astronomers say they have discovered a planet around a distant star.

In past centuries, the trick to discovering a planet was knowing exactly where to look.

Before that, we were discovering new planets and colonizing them.

Since the project began in 1992, it has discovered several extrasolar planets as a side benefit.

I wanted to pilot a spaceship, and discover new planets.

He was the only person to discover a planet in the solar system in the 20th century.