31. The low mass of the planet has led to suggestions that it may be a terrestrial planet . 32. While Project Prometheus and other scientific missions have ended other projects such as Terrestrial Planet Finder continue. 33. Two terrestrial planets ( Earth and Mercury ) display magnetospheres, and thus have molten metal layers. 34. This star is among the top 100 target stars for NASA's planned Terrestrial Planet Finder mission. 35. It has the densest atmosphere of the four terrestrial planets , consisting of more than 96 % carbon dioxide. 36. They orbit on either side of a previously discovered hot Jupiter, the smaller, terrestrial planet closer in. 37. The sensitivity of current detection methods makes it difficult for scientists to search for terrestrial planets smaller than this. 38. The knowledge acquired will aid understanding of the evolutionary history of the terrestrial planets and computations of lunar orbits. 39. The last few planetary formation tend to be the main determiner of a terrestrial planet 's rotation rate. 40. While most later collide and merge to form the larger terrestrial planets , some are scattered outside the band.
