How big is our Sun compared to other stars? In a dramatic and popular video featured on YouTube, the relative sizes of planets and stars are shown from smallest to largest. The above video starts with Earth’s Moon and progresses through increasingly larger planets in our Solar System.
Scientists have estimated the first cosmic census of planets in our galaxy and the numbers are astronomical – at least 50 billion planets in the Milky Way.
Neptune was discovered in 1846. In 2010, astronomers observe as the farthest planet from the sun (sorry, Pluto) completes its first full solar orbit since then, a journey of some 17 billion miles.
If a meteorite breaks in two shortly before hitting the ground, the typical bowl shape of a single impact crater becomes doubled. The two circular blast regions intersect, creating a straight wall separating the two craters.
Image credit: NASA/JPL-Caltech/ASU
Newly released for the holidays, images of Saturn’s second largest moon Rhea obtained by NASA’s Cassini spacecraft show dramatic views of fractures cutting through craters on the moon’s surface, revealing a history of tectonic rumbling.