2004 in science
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- January 3 - NASA's Spirit rover lands on Mars.
- January 24 - NASA's Opportunity rover lands on Mars.
- March 2 - NASA says that the area where their Mars probe Opportunity landed shows unmistakable signs of contact with water in the geological past.
- March 4 - NASA's Spirit finds proof of past contact with water in volcanic rocks on Mars.
- April 20 - NASA launched the Gravity Probe B to test the general theory of relativity of Einstein.
- October 27 - The Homo floresiensis has been discovered by Peter Brown, Michael Morwood and their colleagues.
- September 13 - Astronomers from the European Southern Observatory announce images that seem to show a planet orbiting a brown dwarf about 230 light years away.
- November 15 - The Smart-1 space probe reaches orbit around the Moon. It is the first Europen space mission to do so.
- March 15 - John Pople, British nobel Prize winning chemist
- July 3 - Andriyan Nikolayev, cosmonaut
- July 28 - Francis Crick, found the double helix in DNA