SpaceX was scheduled to attempt to land its Falcon 9 rocket on a floating barge in the Atlantic for the second time tonight, but the launch has been scrubbed because of issues with a first stage transmitter and a range radar. The launch has been postponed until tomorrow evening.
A successful landing would mean SpaceX would be able to reuse the rocket in future missions, which could save millions of dollars over time.
Air Force tracking radar went down. Launch postponed to same time tomorrow.— Elon Musk (@elonmusk) February 8, 2015
Update, February 9th, 10:32 AM: Due to inclement weather, the Falcon 9 launch has been postponed again, from Monday evening until Tuesday evening.