Chemical compositions of rocks from Mars indicate that the earliest orbits of Jupiter and Saturn were more circular than they are today.
orbits & rotations
Posted inEditors' Highlights
Better Thermospheric Monitoring is Vital to Space Safety
Better real-time estimates of thermospheric density are vital to the safe management of satellite traffic in Low Earth orbit, ensuring those satellites continue to deliver critical services.
Posted inResearch Spotlights
Electron Density near Enceladus Shows Orbital Variation
The electron density peaks well after the activity of the moon’s distinctive south polar ice plume reaches its maximum, but the cause of the lag remains puzzling.
Posted inEditors' Highlights
New Energetic Neutral Atom Emissions from Jupiter, Io, and Europa
The first Jovian off-equator Energetic Neutral Atom viewings reveal distinct emissions from Jupiter and the orbits of Io and Europa: Energetic particle injections surprisingly occur inside Io’s orbit.
Posted inNews
Sunburned Surface Reveals Asteroid Formation and Orbital Secrets
Thanks to spectacular high-resolution images from Hayabusa2, scientists can now better estimate how and when the asteroid Ryugu formed, how its orbit has changed over time, and what its surface looks like.
Posted inResearch Spotlights
Atmospheric Drag Alters Satellite Orbits
A new modeling study shows how the density of the thermosphere influences the paths of satellites in low Earth orbit.
Posted inNews
Jupiter’s Galilean Moons May Have Formed Slowly
A new model is the first to simultaneously explain many of the moons’ characteristics, including their mass, orbits, and icy composition
Posted inEditors' Highlights
Peeling Back the Layers of the Climate of Mars
A new study ties layers in the polar deposits of Mars to changes in climate driven by orbital variations, constraining accumulation rates and further deciphering the climate history of the Red Planet.
Posted inNews
New Proof That Accretion Disks Align with Their Black Holes
In the most detailed and highest-resolution black hole simulation to date, an international team of researchers showed the Bardeen-Petterson effect for the first time.
Posted inNews
Earth’s Eccentric Orbit Helped Preserve Rare Soft-Tissue Fossils
Cyclical changes in Earth’s orbit helped to preserve rare fossils in Morocco.