21.   Astronomers find evidence of planetary formation.

22.   Astronomers have found dust rings surrounding many hydrogen-burning stars.

23.   Astronomers have found a mysterious dust cloud far outside our solar system that may be giving birth to a planet in distant orbit around a dying sun.

24.   For the first time, astronomers have found a distant planetary system with at least one planet whose orbit resembles a member of our solar system.

25.   It marks the third time in the past year that astronomers have found what were thought to be the most distant objects yet.

26.   It is the third time in the past year that astronomers have found what were thought to be the most distant objects yet.

27.   The galaxy found by astronomers using the Hubble Space Telescope lies near the edge of the universe.

28.   Astronomers have found further evidence that comets had their origin in the formation of the solar system, the scientific journal Nature reported in its latest issue.