41. But space instruments are being designed to look for smaller, terrestrial planets in orbits more like Earth's. 42. Near the star, the planetary embryos go through a stage of violent mergers, producing a few terrestrial planets . 43. In a quarter of the simulation Planet V was ejected or impacted the Sun without other terrestrial planets suffering collisions. 44. The D / H isotopic ratio is a primary constraint on the source of H 2 O of terrestrial planets . 45. He also made significant contributions to the study of HED meteorites and studied the origin of water in terrestrial planets . 46. The second step, to be taken in about 10 years, would be a mission called the Terrestrial Planet Finder. 47. The big bullies may wipe clean the terrestrial planets in those planetary systems, rendering them void of any Earth analogs. 48. "Right now, we are paying to people to think about terrestrial planet finders, " he said. 49. It is estimated that 50 60 % of binary systems are capable of supporting habitable terrestrial planets within stable orbital ranges. 50. Examples are mountains, hills, polar caps, and valleys, which are found on all of the terrestrial planets .
