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Brightest Stars
Fomalhaut is the Loneliest Star once again
Fomalhaut is known as the Loneliest Star because it shines brightly in a dim patch of sky. Saturn joined it in recent years, but is now pulling away.
September 2, 2026
Space
How do lava-world exoplanets keep their atmospheres?
A new study from researchers at Stanford University helps explain how hot lava-world exoplanets orbiting close to their stars can maintain their atmospheres.
September 1, 2026
Earth
Will El Niño become supersized? What experts are saying
El Niño is here. But will it become supersized? NOAA says there's a 90% or greater chance for El Niño to become "very strong" between September and January.
September 1, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: Look for the moon close to Saturn tonight. Plus Jupiter is returning at dawn. Watch the new "this week's sky" video.
September 1, 2026
Space
Pioneer 11: Watching the Saturn Watchers
Pioneer 11 made history 47 years ago today when it became the 1st spacecraft to fly past Saturn, revealing the ringed world up close for the 1st time.
September 1, 2026
Human World
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
Earth
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
Astronomy Essentials
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
Earth
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
Constellations
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
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