The Galileo spacecraft had distant encounters with Earth in 1990 and 1992. Limited Solid State Imager (SSI) data acquired during these encounters has been previously presented, but the majority of […]
The in-situ characterization of moon-magnetosphere interactions at Jupiter and the mapping of moon auroral footpaths require accurate global models of the magnetospheric magnetic field.
In its December 1990 fly-by of Earth, the Galileo spacecraft found evidence of abundant gaseous oxygen, a widely distributed surface pigment with a sharp absorption edge in the red part […]
ESA’s Jupiter Icy Moons Explorer (JUICE) will provide a detailed investigation of the Jovian system in the 2030s, combining a suite of state-of-the-art instruments with an orbital tour tailored to […]
Research reveals a new explanation for how the icy shell of Jupiter’s moon Europa rotates at a different rate than its interior. NASA’s Europa Clipper will take a closer look.
We constrain Europa’s tenuous atmosphere on the subsolar hemisphere by combining two sets of observations: oxygen emissions at 1304 Å and 1356 Å from Hubble Space Telescope (HST) spectral images, […]
![An artist’s depiction of our world when the Earthshine measurements were taken, enhanced to show the “red edge” from vegetation. A distant astronomer on another planet would see the spectral signatures of our oxygen atmosphere, water, and chlorophyll from land plants. [enlarge] Credit: John Walker’s “Earth Viewer,” Christine Lafon, (Harvard-Smithsonian Center for Astrophysics).](https://i0.wp.com/astrobiology.com/wp-content/uploads/2002/10/Astronomers-Find-Life-on-Earth.png?resize=1200%2C719&ssl=1)
Now that the discovery of extrasolar planets, or planets around distant stars, has become relatively routine, scientists are now tackling the next step: finding life-bearing worlds. To do this, observers […]
