Jupiter and Saturn, the two largest planets in the Solar System, are known for their large and varied systems of moons. At present count, Jupiter has more than 100 moons, while Saturn has more than double that, with over 280 known satellites. However, Jupiter's system of satellites includes four large moons - Io, Europa, Ganymede, and Callisto - and this system contains the largest moon in the Solar System (Ganymede). Meanwhile, Saturn's system of satellites is dominated by one large moon (Titan), the second largest in the Solar System.
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NEAF 2026 returns to New York this weekend with all-star astronaut lineup and 'world's largest' space expo
Thousands of enthusiasts, professionals and curious skywatchers will gather this weekend for the world’s largest and most spectacular astronomy and space expo.
NASA confident Artemis 2 heat shield will protect crew during re-entry
The Artemis 2 heat shield undergoing inspections at the Kennedy Space Center before installation on the base of the Orion capsule bringing four astronauts back to Earth Friday after a flight around the moon. The heat shield is designed to protect the craft from re-entry temperatures as high as 5,000 degrees. Image: NASA.
When the Artemis 2 Orion crew capsule returns to Earth after flying around the moon, it will hit the discernible atmosphere some 75 miles above the Pacific Ocean at a blistering 24,000 mph, fast enough to fly from New York to London in less than 10 minutes.
The Artemis 2 astronauts saw a rare solar eclipse from beyond the moon. Here's what it looked like
A newly released NASA timelapse reveals the moon crossing the sun as seen from deep space, giving the Artemis 2 crew a rare extended view of totality and the solar corona.
It's Not Supposed To Be Like This: A Giant Planet Orbits A Small Star
The nebular hypothesis states that stars and the planets that orbit them form from the same reservoir of material, called a solar nebula. It's the most commonly accepted explanation for how solar systems form. But despite its ability to explain many things about solar system formation, there are some outstanding questions.
Why I'm hunting for Comet Pan-STARRS right now — before it's too late
A rare long-period comet returns after 170,000 years — here's how to find comet C/2025 R3 (Pan-STARRS) before sunrise this April, with key dates, viewing tips and the best mornings to look.
Rubin Observatory Announces 11,000 New Asteroids
The Vera C. Rubin Observatory will discover up to 500,000 solar system objects every year. It’s already starting to deliver on that promise.
'They’re not shipping cows up to Mars': 'For All Mankind' creators talk scientific accuracy and colonial inspirations behind season 5 (interview)
We chat with "For All Mankind" creators Ben Nedivi and Matt Wolbert about season 5's dramatic arc, scientific accuracy, and real-world parallels.
NASA took this camera gear to space aboard Artemis 2, and you can own it, too!
Artemis 2 is the first crewed lunar mission in over 50 years, but the cameras onboard are surprisingly down-to-earth. Here's how to get your hands on the gear that has brought us so many stunning shots of space.
ESA Launches 7 New Missions to Supercharge Space Data Transfer
Space is getting crowded - and not just with satellites, but with the massive amounts of data they’re generating. The amount of information being generated and passed through orbit is exploding. From high-resolution Earth observation images to global maritime monitoring, it’s also become a critical link in our infrastructure. But there’s another space this growing crowd of satellites is dependent on that is also filling up fast - the radio frequency spectrum. If we want to keep expanding our orbital infrastructure, we need to rethink how we move data around. On March 30, 2026, the European Space Agency (ESA) supported a series of eight CubeSats and one specialized payload on SpaceX’s Transporter-16 rideshare mission with the overarching goals of testing high-throughput laser communication, inter-satellite networking, and in-orbit artificial intelligence processing to make space data transfer faster, more secure, and vastly more efficient.
Artemis 2 spies a crescent Earth above the moon's horizon | Space photo of the day for April 10, 2026
Earth shines above the lunar horizon in a new Artemis 2 photo.
Ripples in spacetime may have revealed 1st evidence of tiny black holes born in the Big Bang
Gravitational waves may have provided the first tantalizing evidence of tiny primordial black holes born during the Big Bang, which could account for dark matter.
Watch NASA's Artemis 2 astronauts return to Earth live online today (April 10)
Live coverage of Artemis 2's splashdown begins this evening as four astronauts return from their historic 10-day mission around the moon.
Where will NASA's Artemis 2 moon mission land today?
The Artemis 2 astronauts will return to Earth this evening (April 10) with a splashdown in the Pacific Ocean. Here's where they'll hit the water, and why that spot was chosen.
What time is NASA's Artemis 2 moon mission landing today? Full schedule
Artemis 2 splashes down on April 10. Here's everything you need to know.
Artemis 2 moon astronauts splash down today — What to expect at each stage of reentry & landing (timeline)
It's splashdown day for NASA's Artemis 2 moon astronauts. Here's what to expect at every stage.
This Week's Sky at a Glance, April 10 – 19
A thin crescent Moon points the way to super-difficult Mercury and Mars low in the dawn, then the opposite crescent plays with bold Venus and the Pleiades in evening twilight.
Earth from Space: Lava flow on Réunion Island
Image: This Copernicus Sentinel-2 image captures an active lava flow on the Piton de la Fournaise volcano on Réunion Island.
ESA’s Celeste broadcasts first navigation signal from low Earth orbit
The European Space Agency has achieved a European first with Celeste, successfully transmitting a navigation signal from low Earth orbit, following the launch of the mission’s first satellites on March 28.
Scientists Spot a Solar Flare With Surprising Spectral Behavior
On August 19, 2022, solar astronomers using the Daniel K. Inouye Solar Telescope (DKIST) on the Hawaiian island of Maui caught the fading remnants of a C-class solar flare. Their observations showed something unusual: very strong spectral fingerprints of calcium II H and hydrogen-epsilon lines. It was the first time these two light signatures were seen in great detail during the decline of a solar flare. According to computer models, those lines were stronger than expected and play a not well-understood role in how flares heat the solar atmosphere where they occur. The same models can be used to study flares in other stars, as well.
