Oumuamua illustration by Stuart Rankin Humans like to label things. In general, this works out for us. If you go to a furniture store and ask for a sofa, they will show you things multiple people can sit on that are clearly sofas. Ask for a chair, and they will show you seating for one in a variety of styles. The problem is, there are things out there, like my Ikea hack of not-a-chair-or-sofa that defies classification. In our solar system, we don’t … or at least we don’t yet… have solitary orbiting sofas and chairs. What we do have are comets and asteroids. Asteroids, like the...
Closer Look: Io and Juno Begin to Part Ways
Jupiter’s four largest satellites, the Galilean moons, are named after consorts of the Roman god Jupiter: Io, Europa, Ganymede, and Callisto. Credit: NASA/JPL/DLR In Roman mythology, Jupiter is not exactly a faithful god. Some would allege him willing to bed just...
The Dying Sun will Take Out the Earth
Clumps of debris from a disrupted planetesimal are irregularly spaced on a long and eccentric orbit around the white dwarf. Individual clouds of rubble intermittently pass in front of the white dwarf, blocking some of its light. Because of the various sizes of the...
Unexpectedly on the Endangered List: Antarctic Meteorites
Solar radiation heating the surface of a blue ice area. Photo taken during the 2023-2024 fieldwork mission of the Instituto Antártico Chileno (INACH) to Union Glacier, Ellsworth Mountains, Antarctica. Credit: Veronica Tollenaar, Université Libre de Bruxelles. As...
Watching Atoms Escape Venus
This image was processed from archived Mariner 10 data by JPL engineer Kevin M. Gill. Credit: NASA/JPL-Caltech Atmospheres are what make a planet good or evil for life. One of the questions I get asked most often is, “Can we terraform Venus to be like Earth?” Sure!...
Catch the (Alien) Rainbow
Each glory is unique, depending on the composition of the planet’s atmosphere and the colors of the light from the star that illuminates it. WASP-76 (the «Sun» of WASP-76b) is a yellow and white main sequence star like our Sun, but different stars create glories with...
It’s a Star-Eat-Planet Universe Out There
Artist's impression of a terrestrial planet being captured by a twin star. Credit: intouchable, OPENVERSE Data, at the end of the day, is our first and last source of understanding. We look, build models to match what we see, predict things we haven’t seen yet, and...
Closer Look: Diversity Makes Understanding More Difficult (Planetary Edition)
Planet-forming discs around young stars and their location within the gas-rich cloud of Orion, roughly 1600 light-years from Earth. The mesmerising images of the discs were captured using the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument...
Can Radar Protect Us From the Earth-Killer?
Deep Space Station 13 at NASA’s Goldstone complex in California – part of the agency’s Deep Space Network – is an experimental antenna that has been retrofitted with an optical terminal. In a first, this proof of concept received both radio frequency and laser signals...
Using Radar to Watch Asteroid Rotation
The day before asteroid 2008 OS7 made its close approach with Earth on Feb. 2, this series of images was captured by the powerful 230-foot (70-meter) Goldstone Solar System Radar antenna near Barstow, California. Credit: NASA/JPL-Caltech One of the most...
Migration Solves Exoplanet Puzzle
Artistic representation of an exoplanet whose water ice on the surface is increasingly vaporizing and forming an atmosphere during its approach to the central star of the planetary system. This process increases the measured planetary radius compared to the value the...