Astronauts have been venturing intospace for 61 years to unlock the human potential for exploration. But the floating freedom offered by a lack of gravity also presents a number of limits when it co… [+6902 chars]
An artist’s rendering of the early solar system, featuring the proto-Sun, newly forming planets, and circumstellar disk. Credit: NASA/JPL-Caltech/T. Pyle (SSC) Billions of years ago, when the Sun wa… [+3203 chars]
