Three years ago, on October 19, 2014, comet C/2013 A1 Siding Spring passed within 138,000 kilometers of Mars. At the 2017 meeting of the Division for Planetary Sciences of the American Astronomical Society, we heard a progress report on Mars orbiter imaging of the comet's nucleus.
India's Mars Orbiter Mission has now completed three years in orbit at Mars, and ISRO celebrated the anniversary by releasing the mission's second-year data to the public. Emily Lakdawalla spent a week downloading and processing data for your enjoyment.
Making Mars habitable will require us to master the conversion of raw Martian materials into resources we can use to survive. Fortunately, Mars has a wealth of usable materials, making it one of the most human-habitable places in the solar system, other than Earth itself.
Since December 1, 2016, Curiosity has been unable to drill into rocks because of a serious problem with one of the drill's motors. Emily Lakdawalla thoroughly explains the issues and the path forward for Curiosity.