When a privately built rocket aborted its launch attempt at the very last second on Saturday, it was likely a familiar sight to the booster's builders: The California-based company SpaceX.

SpaceX's unmanned Falcon 9 rocket aborted its launch attempt this morning just as the countdown reached T minus 0.5 seconds and the rocket's nine main engines ignited, apparently due to an unexpectedly high engine pressure reading. The rocket will now have to wait until at least Tuesday to attempt to launch SpaceX's first robotic Dragon space capsule flight to the International Space Station.

Don't you just hate reading a review and finding out about the ending of a film or book before you see it for yourself? Here are tips on adding spoiler warnings to avoid making the same mistake in your own reviews.

Starting at 11:15 UT on June 23, Pluto and its largest moon Charon will both occult a very bright star. Just a few days later, beginning at 14:18 UT on June 27, Pluto and its smaller moon Hydra will each pass in front of a different bright star.