Earth and its Solar System compatriots all have nearly circular orbits, but many exoplanets orbit their stars on wildly eccentric paths. Is our home system strange? Or is our sense of the data skewed?
How good are citizen-scientists at characterizing crater densities and size distributions on the lunar surface? For that matter how good are the experts? Today’s study attempts to answer these questions by having a group of experts analyze images of the Moon from the Lunar Reconnaissance Orbiter Camera.
Why resort to complicated theories that involve mysterious, unknown forces and states of matter? The geocentric model of the Universe nicely explains 1st century C.E. data.
Pluto’s small satellites have very low escape velocities, which means that dust kicked up by impacts has a relatively easy time of escaping rather than settling back down to the little moon’s surface. Today’s paper looks at the fates of that dust.
Even though we can’t see any liquid water on Mars today, we can still examine the history of water loss on the Martian surface.
Strongly magnetized rocks on Mars are primarily concentrated in the southern hemisphere. This paper raises a serious objection to the hypothesis that localized dynamo action in the ancient martian core explains this puzzling observation.
For planets too old for plate tectonics, a companion planet could drive tidal heating to keep conditions primed for life.
Large plumes of water vapor were recently found on the dwarf planet Ceres in the asteroid belt. Using Ceres’ rotation, astronomers have located two possible sources for the water vapor on the surface.
A new model explains the common 0.1 bar temperature minimum in certain types of planetary atmospheres.
How do so many hot jupiters come to orbit backwards?