Astronomy / Astrophysics

From the left: Venus, Earth, Mars. A comparison of their sizes (image NASA)

Accoring to a research made by an international team of scientists Mars small size might be the result of Jupiter moving towards the Sun while it was forming, which might have absorbed part of the matter present in the orbit of what then coalesced into the red planet.

Statue of Andrei Sakharov at the Univirsity of St. Petersburg

Andrei Dmitrievich Sakharov was born on May 21, 1921 in Moscow, then in the USSR. He took part to Soviet nuclear program and seeing the weapons power helped him to develop his activism against atomic proliferation. In 1975 he was awarded a Nobel Peace Prize.

A comparison of the same part of the Tempel 1 comet before and after being hit by the impactor launched by the Deep Impact probe (photo NASA)

In July 2005 the Deep Impact probe made the first visit to the comet Tempel 1, in recent days the Stardust spacecraft has taken new photos, including the ones of the crater left by the impactor launched from Deep Impact, and made new measurements to improve our knowledge.