Skywatch

  • February 7, 2008

    Episode 144: Message to Mercury

    Download this episode

    Shownotes

    Mercury, the closest planet to the sun, is hard to observe from Earth. We know a little about it from the Mariner 10 spacecraft that flew by Mercury in 1974, but a large part of the planet was never mapped. Messenger, launched in 2004, recently reached Mercury, taking color pictures and probing the planet's mysterious magnetic field.