1.   Astronomers have discovered a starlike object that was, relatively speaking, right under their noses all this time.

2.   Astronomers have discovered two more planetary systems in the universe, and they appear to bear little or no resemblance to each other or to the solar system.

3.   Astronomers discovered the asteroid only after it had whizzed by the planet.

4.   Astronomers have discovered two strange stars whose nature is unlike anything they have ever seen, suggesting that the stellar objects are a new form of matter.

5.   At the same time, astronomers have discovered that many frequencies they once considered barren actually carry a wealth of information about the cosmos.

6.   Detected at just the right moment, astronomers have discovered, these beacons seem to show the way to long-sought landfalls of knowledge.

7.   For the fifth time in two years, astronomers have discovered an asteroid hurtling through space that might collide with the Earth.

8.   His telescope project nevertheless took on immense importance when the astronomer Edwin Hubble, of Mount Wilson, discovered that the universe was expanding.

9.   Slowly, astronomers have discovered a few dozen other lensed quasars.

10.   The good news is that astronomers have just discovered two new planets orbiting Sun-like stars that may have intelligent, even patch-free life.