It was previously believed Pluto was the same size as Earth but scientists now know it is two-thirds the diameter of Earth's moon
UPDATE: Earth's moon
and Mars are not alone in their pockmarked appearances.
How might Superman's strength change if he's visiting Earth's moon
or his home planet of Krypton?
Scraps of similar measurements can be found on Earth's moon
Pluto, previously seen only as a fuzzy disc, is now known to be a world with mountains and plains - and few craters of the type seen on the Earth's moon
The "50 Years Ago" update in Notebook mentioned that Earth's moon
is accruing dust at a rate of about a millimeter every thousand years, about 10 times faster than scientists had previously thought (SN: 2/22/14, p.
It's only the fourth of its kind covering a planetary satellite; similar maps exist for Earth's moon
as well as Jupiter's moons Io and Callisto.
Stevenson says this study is the first time Venus's lack of a satellite has been researched since models convincingly showed that an impact formed Earth's Moon
He estimates that the satellite is eight times smaller than Earth's moon
But it is also the smallest of the planets--smaller even than the Earth's moon
SIZE: At 4,217 miles across it's about half the size of Earth and twice the size of Earth's moon
This cluster, funded primarily by the National Aeronautics and Space Administration (NASA), will be used to study collisional processes in the solar system, such as the origin of Earth's Moon
by a giant impact, the disruption of meteors in the atmospheres of planets, the formation of impact craters, and the fragmentation of asteroids by impacts and explosions.