Why can the earth be a star with a rich life? How much do we know about the Earth, the solar system, the universe? In order for life to survive, we need a barrier to protect the body from humid environment and cosmic radiation (planetary magnetic field).
　One of the reasons for the occurrence of life is that the earth is located at a reasonable distance from the sun. However, we do not know when the atmosphere has occurred and how humid environments have been maintained. How harsh environment is Mars and Venus for life?  Is there a possibility that the atmospheric environment of the earth will change like Mars?
　In order to elucidate these mysteries and atmospheric diversity, our laboratory develops invisible special light observation machines. These machines are mounted on the planetary spacecraft in the solar system, the space station, and the satellite orbiting the earth, scan the solar system planet and analyzes the components and movements of the planetary atmosphere.
　The planet spectroscopic observation satellite “Hisaki” (SPRINT-A) launched in Epsilon rocket in September 2013 is a “space telescope” with eyes to see extreme ultraviolet light.Extreme ultraviolet light is a light of short wavelength among ultraviolet light. When looking at extreme ultraviolet, we can see the earth of quite different shape from the blue and round earth we are seeing. For example, a plasma (ionized gas) filled with a butterfly-like figure (dipole magnetic field) spreading in a space five to six times the Earth’s radius is taken with the north pole and the south pole as the base.
　If we observe other planets in the extreme ultraviolet region, we will be able to elucidate not only the differences from the Earth, but also the process of the formation of the planet atmosphere. Based on these findings, we will expand the observation target and lead to “Life survey outside the solar system”.