ESA's Venus Express has discovered an ozone layer on Venus. Comparing Venus' ozone layer to those on Earth and Mars will help astrobiologists refine the search for life on other planets. Comparing Venus to Earth can also help scientists better understand the principles of climate change on our own planet.
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Secrets of Asteroid Minerva and its Moons Topic: Meteorites, Comets and Asteroids | 10/10/11
Observations of Minerva indicate that it may be structurally unique among asteroids.