Journey to Mars space for them. A Martian revolution disrupts his plans, however; he writes no account of his adventures prior to an attempt to return to the red planet. Gustavus W. Pope (1828–1902) was a physician based in Washington DC, who wrote several books on a range of subjects (including one on Shakespeare's supposed Roman Catholicism). Pope followed his "Journey to Mars" with "Journey to Venus the Primeval World; Its Wondrous Creations and Gigantic Monsters" (1895), in which Hamilton and Suhlamia visit that planet. "Journey to Mars" has been reprinted in two modern editions, from Hyperion Press in 1974 and from Wildside
Colonization of Mars protect astronauts and spacecraft from radiation. In September 2017, NASA reported radiation levels on the surface of the planet Mars were temporarily doubled, and were associated with an aurora 25-times brighter than any observed earlier, due to a massive, and unexpected, solar storm in the middle of the month. Mars requires less energy per unit mass (delta V) to reach from Earth than any planet except Venus. Using a Hohmann transfer orbit, a trip to Mars requires approximately nine months in space. Modified transfer trajectories that cut the travel time down to four to seven months in space are possible