Why do the solar system’s planets have different compositions?
Back to Article List From the February 2025 issue While the composition of gas and dust in a molecular cloud ...
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Top 10 space stories of 2024
The exoplanet K2-18 b may have an ocean of water beneath a hydrogen-rich atmosphere, as shown in this artist’s concept. ...
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February 2025: What’s in the sky this month? Venus, Jupiter, and Mars continue to dominate the sky, and the Moon occults the Pleiades
We’re quickly losing sight of Saturn, but Venus, Jupiter, and Mars dominate the sky. Uranus and Neptune are easy binocular ...
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After our Sun becomes a white dwarf and cools completely, what will be left?
Back to Article List From the January 2025 issue Our white dwarf Sun will cool for billions upon billions of ...
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Does a comet’s period change because it loses mass every time it nears the Sun?
Several bright jets spew from the surface of Comet 67P/Churyumov-Gerasimenko as ices on the nucleus turn to gas. This image ...
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Explore the constellation Cassiopeia
Cassiopeia and its distinctive W-shaped asterism rise above the erupting volcano Mount Etna on the island of Sicily, Italy. Credit: ...
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Where is the solar system heading?
Back to Article List The Sun, the planets, and all the other flotsam and jetsam that constitute the solar system ...
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How Artemis will land humans on the Moon
The Starship HLS stands like a giant 1950s science-fiction spaceship in this artist’s concept, spanning 30 feet (9 m) wide ...
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What’s in the sky this month? The Moon occults Mars and the Pleiades, plus Mars reaches opposition
A composite shows the Dec. 7, 2022, occultation of Mars by the Moon. Although the time-lapse image makes it look ...
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How do spacecraft avoid collisions in the asteroid belt?
Back to Article List From the December 2024 issue The main belt located between the orbits of Mars and Jupiter ...
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