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Sapphire: September birthstone comes in many colors
Sapphire, the September birthstone, is typically blue, the color caused by small amounts of titanium and iron in the crystal structure.
September 1, 2026
Giant trees break a decades-old science theory
Giant trees have evolved remarkable adaptations that allow them to reach extreme heights while maintaining efficient water transport.
August 31, 2026
Do the planets revolve around the sun? Not exactly
Do the planets revolve around the sun? Not exactly. The sun and planets orbit a common center of mass, which, right now, is outside the sun.
August 30, 2026
Do you love twilight? The 3 stages explained
Twilight is that magical time between sunlight and darkness. Astronomers, experts on nighttime, recognize 3 stages of twilight.
August 30, 2026
Telescopium the Telescope is below the Teapot
Telescopium the Telescope is a constellation that appears best in southern skies, south of the Teapot. Look for it in dark skies.
August 30, 2026
‘Jellyfish’ on Mars: Image from Curiosity rover goes viral
What is this odd 'jellyfish' on Mars? Possibilities include a cosmic ray artifact, an electronic artifact and what astronomers call a "transient phenomenon." The image went viral this week!
August 29, 2026
Best eclipse photos! Nearly total, August 27-28
EarthSky community photos of the lunar eclipse of August 27-28, 2026. Thanks to all who submitted eclipse photos!
August 28, 2026
Meet a Saturn-sized exoplanet with Earth-like temperatures
TOI-199b is a warm Saturn-sized exoplanet 330 light-years away. New observations by the Webb space telescope show there is methane in its atmosphere.
August 28, 2026
Huge rift valleys on Venus hint at a still-living planet
A new study of huge rift valleys on Venus shows that they are likely younger than previously thought, and might still be geologically active today.
August 28, 2026
The Wild Duck cluster, M11, a lovely open cluster in Scutum
The Wild Duck cluster, also known as M11, is an open star cluster in the constellation Scutum that appears best through binoculars or a telescope.
August 28, 2026
