Science ❯ Astronomy

Planetary Characteristics

Brightness Venus Super-Earths Atmospheric Conditions Size and Shape Planetary Atmospheres Mass and Size Mercury Temperature Planetary Features

Six-Planet Parade to Line Up in Saturday’s Twilight Sky

Astronomers say the lineup is a perspective effect along the ecliptic, with four planets visible unaided and the two outer worlds requiring optics.

JWST Charts Uranus’s Upper Atmosphere in 3D, Exposing Auroral Bands and a Cooling Trend

Mercury Retrograde Begins Feb. 26 in Pisces, Running Through March 20

Six-Planet Parade Peaks Feb. 28 After Sunset: When, Where and How to Watch

Six-Planet Parade to Peak on Feb. 28, but Only Some Will Be Visible Without Optics

Juno Radio Occultations Sharpen Jupiter’s Dimensions, Reveal Greater Oblateness

Earth-Sized Exoplanet Candidate Found 146 Light-Years Away Around a K-Dwarf

Jupiter at Opposition Tonight, Brightest and Largest of 2026

Webb Finds Carbon-Rich Atmosphere on Lemon-Shaped Planet Orbiting a Pulsar

Saturn's Rings Seem to Vanish in Rare Edge-On Alignment on Nov. 23–24

Scientists Detect Habitable-Zone ‘Super‑Earth’ GJ 251 c Just 18 Light‑Years Away

Webb Spots Tiny New Moon Around Uranus, Bringing Count to 29

NASA to Target Super-Earth TOI-1846 b With James Webb Space Telescope

Study Reveals Jupiter Was Once Twice Its Current Size with a Magnetic Field 50 Times Stronger

Astronomers Confirm Super-Earths Are Common in Distant Orbits Across the Milky Way

Uranus’ Day Found to Be 28 Seconds Longer Than Previously Measured

Hubble Reveals Uranus’ Day Is 28 Seconds Longer Than Previously Measured

Venus to Align Between Earth and Sun During Rare Astronomical Event

Astronomers Confirm Four Rocky Planets Orbiting Barnard's Star

Rare Seven-Planet Alignment Visible This Week