Peering at the Surface of a Nearby Moon
Among Jupiter’s Galilean moons, icy Europa or volcanic Io often take the spotlight — but their sibling moon Ganymede has plenty of secrets to share.
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A New Assessment of Supermassive Black Holes and Our Universe
A recent census of brightly accreting supermassive black holes reveals more about the role they played in the evolution of our universe.
Holding the System of HR 8799 Together
What does the future hold for the multiplanetary system of HR 8799 — can it remain stable?
Measuring Solar Eruptions with a Rare Alignment
In 1998, a mass of plasma erupted from the Sun. Data from two perfectly aligned spacecraft now tell its story.
Warning: Neutron Star Collision Imminent
Could we alert follow-up telescopes to a neutron star collision even before the merger happens?
Selections from 2020: Hubble Observations of Psyche
Ultraviolet observations of the asteroid (16) Psyche reveal more about this unusual body’s surface.
Selections from 2020: Resolving Strands on the Sun
Images from a brief window of observation reveal spectacular strands of plasma in the Sun’s atmosphere.
Selections from 2020: No Hydrogen Ice for ‘Oumuamua
Could interstellar asteroid ‘Oumuamua be a speeding hydrogen iceberg?
Selections from 2020: Habitability of a Super-Earth
Not all habitable worlds are Earth-like! A recent study explored the potential habitability of a larger super-Earth.
Selections from 2020: A Twinkling Black Hole
Recent observations show Sgr A*, the supermassive black hole at the heart of the Milky Way, twinkling in radio light.