The Moon is Earth's only permanent natural satellite. It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits . It is the second-densest satellite among those whose densities are known .
After five years of travel to Jupiter, NASA’s Juno spacecraft entered into the massive planet's orbit late last night. For a sense of scale, the Great Red Spot you can see here at right is far larger than all of planet Earth! Jupiter was most likely the first planet formed after our sun and the technology aboard Juno could lead us to have a better understanding of the origins of our solar system. This Overview was created from a composite of imagery from the Hubble Telescope — Daily Overview
"Supermoon." Bigger and brighter then normal full moons, the supermoon on June 22/23 will be the closest and largest full moon for all of 2013. The moon will be some 29,000 miles closer to Earth than the farthest point in its orbit, but not to worry the moon will still be more than 221,000 miles away from our blue planet. --- This is an animation of the moon that was created using data from NASA's LRO satellite. Credit: NASA/Goddard/LRO
NASA Measures Impact of Solar Flare on Earth's Atmosphere - A key NASA instrument that can directly measure the impact of solar events on the Earth’s upper atmosphere has weighed in on the huge flare that impacted Earth last week. The flare was considered one of the largest solar events in years even though its impact on the power grid and communications was minimal due to the angle it hit Earth.
The Jovian cloudscape boasts the most spectacular light show in the solar system, with northern and southern lights to dazzle even the most jaded space traveler. Jupiter's auroras are hundreds of times more powerful than Earth's, and they form a glowing ring around each pole that's bigger than our home planet. Revolving outside this auroral oval are the glowing, electric “footprints” of Jupiter's three largest moons.
Frigid and alien, yet similar to our own planet billions of years ago, Saturn's largest moon, Titan, has a thick atmosphere, organic-rich chemistry and a surface shaped by rivers and lakes of liquid ethane and methane. Cold winds sculpt vast regions of hydrocarbon-rich dunes. There may even be cryovolcanoes of cold liquid water.