1.   Among other things, to find habitable planets for humanity, Millis said.

2.   Anyway, as I say, lots of folks now are searching for habitable planets besides our own.

3.   Astronomers said they could not rule out a habitable planet or moon in the Upsilon Andromedae system.

4.   Dr. Frederick Chaffee, director of the Keck Observatory in Hawaii, ascribes great importance to the search for extraterrestrial life and habitable planets outside the solar system.

5.   New research also hints that habitable planets may be more common than skeptics have assumed.

6.   Space enthusiasts are also studying ways to transform Mars into a habitable planet.

7.   The search for extraterrestrial life presumes the existence of other habitable planets.

8.   In the past three decades our consciousness about space and the earth as a habitable planet has been influenced by a new discipline which is called space science.