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The 2026 EarthSky lunar calendar makes a great gift. Get yours today! NIST scientists have calculated that clocks on Mars will tick an average of 477 millionths of a second

Sgr A* marks the supermassive black hole at the center of our Milky Way galaxy. The green outlines are locations of star clusters. S2 is one such star cluster. Meanwhile,

View at EarthSky Community Photos. | Steven Bellavia captured Mercury’s sodium tail on the morning of December 3, 2025, from Surry, Virginia. Steven wrote: “A 24-million-km-long plume of gas is

NASA’s Nancy Grace Roman Space Telescope is now fully assembled! The space telescope is currently at the Goddard Space Flight Center in Greenbelt, Maryland. It will now undergo testing before

The Fermi Gamma-ray Space Telescope captured this gamma-ray view of our Milky Way galaxy between 2009 and 2013. Now, a scientist in Tokyo, armed with a new analysis of Fermi

As you can see, EarthSky’s lunar calendar shows the moon phases for each day of the year. How to use EarthSky’s lunar calendar EarthSky’s lunar calendar is a unique, beautiful,

The European Space Agency announced that astronomers have now discovered over 40,000 near-Earth asteroids. This illustration comes from ESA’s new Orbit Visualisation Tool. Image via ESA. Originally published by ESA.

View larger. | Theia and Earth collided about 4.5 billion years ago, as depicted in this artist’s concept. The moon then formed out of the chaos. Image via Max Planck

https://earthsky.org/upl/2024/01/ezgif.com-gif-to-webm-converter.webm NASA’s OSIRIS-APEX spacecraft captured this view of Earth as it soared some 2,100 miles (3,400 kilometers) above our planet’s surface on September 23, 2025. For comparison, satellites in low

View larger. | The 8 potential water-carved caves on Mars – called karst caves – are in the martian Hebrus Valles. They’re mapped here in relation to pit lines, outflow