All of launch dates are tentative, but are a welcome step after concerns that launches would cease due to an unmanned Soyuz crash over Siberia on August 24.
Our solar system might've once had five gas giant planets. The fifth might have gotten the boot after a close encounter with Jupiter, 3.9 billion years ago.
NASA space scientists studying asteroid Vesta helped make this video of Vesta simulating the experience of flying in the Dawn spacecraft around the asteroid.
A newly found first planet orbiting two suns - like the fictional Tatooine, home world of Luke Skywalker in Star Wars. EarthSky spoke to one of the discoverers.