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New research suggests that Nereid, an unusual moon of Neptune, could be the sole survivor of the satellites that formed with the planet... Nearly half of its 16 known moons travel backwards around the planet. One of them is not like the others: Like a swan chick among ducklings, Triton is six times larger than the system's next-largest moon. Nearly as big as Earth's Moon, Triton has long been considered a Pluto-like world, captured in Neptune's orbit when the planet was still young. Now, research suggests that Triton's arrival -- or perhaps even the arrival of some earlier, Triton-like object...

The map of our solar system has changed. For most of history, we viewed our neighborhood as a tidy, organized place. We thought it was a simple system with eight planets orbiting a star, surrounded by a clean void. We assumed there was a clear finish line where the solar system stopped and "deep space" began. The Kuiper Belt proves that this model is wrong. The solar system does not have a hard edge. It does not just end. Instead, it fades away into the galaxy. What we once thought was empty space is actually a massive, chaotic frontier. It...

A new study has proposed the existence of a hidden solar system planet candidate that is smaller and closer to Earth than the infamous, hypothetical Planet X. This new world, dubbed "Planet Y," could be around the same size as Earth and may exist alongside another popular Planet Nine candidate; potentially bringing our solar system's planetary tally to 10, if both can be confirmed. Did the Sun Pull a Rogue Planet into the Solar System? | 10:19 Territory | 123K subscribers | 146,224 views | September 21, 2026 Narrated by Mathew McQuinn

Enlarge ImageSurprise! The IBEX spacecraft, preparing to explore deep space (inset), accidentally made an important discovery about the moon.Credit: Southwest Research Institute Scientists probing the outer reaches of our solar system have hit upon an unusual phenomenon much closer to home. Instruments aboard a NASA spacecraft have detected fast-moving hydrogen atoms emanating from the moon. The atoms, which originated as protons from the sun, may help scientists study the lunar surface and other solar system objects in greater detail than believed possible. The moon is continuously being pelted by hazardous radiation. Most of it comes from the solar wind,...

Explanation: If you went outside at the same time every day and took a picture that included the Sun, how would the Sun's position change? A visual answer to that question is an analemma, a composite image taken from the same spot at the same time over the course of a year. The featured analemma was composed from images taken every few days at noon near the village of Callanish in the Outer Hebrides in Scotland, UK. In the foreground are the Callanish Stones, a stone circle built around 2700 BC during humanity's Bronze Age. It is not known if...

[snip] Uranus has 29 confirmed moons. Only one spacecraft has ever visited the planet -- and that was in 1986 for just a few hours. Yet in the last two years alone we have discovered a brand new moon, found hidden oceans beneath multiple moons, and revealed that the dark sides of its largest moons are on completely the wrong hemisphere. In this video we break down every weird moon of Uranus -- from a world with the tallest cliff in the entire solar system, to a moon with a single mysterious bright ring sitting alone on an otherwise pitch...

The United States has publicly confirmed for the first time that it has weapons deployed in orbit. The revelation could accelerate spending on missile defense, military satellites and space security, creating opportunities for defense stocks and space ETFs while raising the risk of a costly new arms race. Air Force Secretary Troy Meink delivered the news almost casually during the Air, Space & Cyber Conference in Maryland. “We are increasing readiness against existing threats, and the United States has on-orbit space control weapons capable of defending the Joint Force against hostile adversary action,” Meink said. Then the details stopped. Meink...

Secretary of the Air Force Troy Meink made a bombshell admission this morning, disclosing that there are on-orbit weapons deployed right now to protect America’s interests in space. Those weapons support a Space Control mission set, and the U.S. Space Force has now also shared additional details about that directly with TWZ. Meink first made mention of what he described as “on-orbit space control weapons” during his keynote speech earlier today at the Air & Space Forces Association’s (AFA) 2026 Air, Space & Cyber Conference, at which TWZ is in attendance. As head of the Department of the Air Force,...

Explanation: This sight was worth getting out of bed early. Just over four years ago, Comet C/2020 F3 (NEOWISE) rose before dawn to the delight of northern sky enthusiasts awake that early. Up before sunrise on July 8th, the featured photographer was able to capture in dramatic fashion one of the few comets visible to the unaided eye this century, an inner-Solar System intruder that has become known as the Great Comet of 2020. The resulting video detailed Comet NEOWISE from Italy rising over the Adriatic Sea. The featured time-lapse video combines over 240 images taken over 30 minutes. The...

This image of the Neptune system, captured by the Near-Infrared Camera (NIRCam) on NASA’s James Webb Space Telescope in 2022, reveals stunning views of the planet’s rings—which have not been seen with this clarity in more than three decades—along with the planet’s inner moons. Credit: Image: NASA, ESA, CSA, STScI; Image Processing: Joseph DePasquale (STScI), Naomi Rowe-Gurney (NASA-GSFC) Neptune’s tiny moons may be ancient wreckage, preserving material exposed when a catastrophic event shattered much larger icy worlds. In 1989, Voyager 2 discovered six previously unknown moons around Neptune. Five of them are tiny satellites that travel just beyond the planet’s...

Explanation: Nā ʻUhane Māhoe Huki Pū i ke Ola, is the Hawaiian name given to this image of a pair of spiral galaxies locked in a mutual gravitational embrace. Some 200 million light-years distant toward the high flying constellation Pegasus their spectacular, galactic scale merger is captured in sharp detail in the image from the 8.1 meter Gemini North telescope on Maunakea, Hawai‘i. The galaxy pair, known as NGC 7253 and Arp 278, was chosen as a target, researched, and given a Hawaiian name by high school students in the joint Gemini Observatory and University of Hawaiʻi Project Hōkūlani internship...

SpaceX is targeting Sunday, August 30 for Falcon Heavy’s launch of NASA’s Roman Space Telescope mission from Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. Liftoff is targeted for 7:26 a.m. ET, with a backup opportunity available on Monday, August 31 at 7:22 a.m. ET. A live webcast of this mission will begin about one hour prior to liftoff, which you can watch here and on X @SpaceX. This is the first and third flight for the two first stage side boosters supporting this mission, which previously launched the GOES-U and Viasat-3 F3 missions. Following stage separation,...

In August of 2006, astronomers at the International Astronomical Union (IAU) democratically voted to reclassify Pluto as a dwarf planet — but 20 years later, with our greater knowledge and understanding of planetary systems, is it time to revisit the controversial decision? Should Pluto be called a planet again? For several years before the IAU vote, there had been agitators among the astronomical community lobbying for our solar system's nine worlds to become eight, and for Pluto's planetary status to be revoked. In 2000, Neil DeGrasse Tyson even went as far as to remove Pluto from the planets display at...

At Kimmeridge Bay [Dorset, UK] on the Jurassic Coast, the rocks have a bit of a pattern to them. And there's a good reason for that! It's a record of changes in Earth’s climate that were driven by something happening far beyond Dorset: the changing geometry of Earth’s orbit around the Sun... Because Earth's orbit changes over time in cycles! Welcome to Milancovich cycles! This is far from the only rock unit that shows this, and in fact the Blue Lias around Lyme Regis is also pretty famous for this, but I found this cool paper that really investigated it...

A clever swap has extended the historic Voyager 2’s mission in interstellar space. Engineers are hoping to do the same for Voyager 1. An ambitious effort to boost an aging probe on its journey through the uncharted territory of interstellar space seems to have found success. Engineers at NASA’s Jet Propulsion Laboratory in Pasadena, California, have spent the last few months implementing what they nicknamed the “Big Bang” fix to buy the historic Voyager 2 spacecraft more time to continue its science mission. Voyager 2 is roughly 21.35 billion kilometers (13 billion miles) away from Earth, while its twin, Voyager...

This artist’s concept shows the red supergiant star Betelgeuse and a companion star orbiting within the supergiant’s tenuous outer atmosphere. Artwork: NASA, ESA, Elizabeth Wheatley (STScI); Science: Andrea Dupree (CfA) Betelgeuse has always been something of a mystery. And by “mystery,” I mean a source of endless fun, fascination and frustration for astronomers. Betelgeuse is one of the brightest stars in the sky, marking the right shoulder of the constellation Orion. It’s a red supergiant, a massive star with more than a dozen times the sun’s heft, that’s blasting out many tens of thousands as much light as our own...

At the quantum scale, tiny particles behave in bizarre ways. One reason for this is the uncertainty principle, which says that the more you know about where a quantum particle is, the less you can know about how fast it’s moving, and vice versa. The new uncertainty principle relates to fractals, shapes that remain equally complex no matter how much you zoom in on them. Around a decade ago, Semyon Dyatlov was studying whether quantum particles behave differently than ordinary particles when put into the same chaotic situations. Sometimes, an object moving chaotically can become trapped into following a fractal-like...

timeanddate.com’s live stream of the total solar eclipse on August 12, 2026, which will be visible from parts of Russia, Greenland, Iceland, and Spain.

Project Hail Mary is my favourite movie of the year, and while many people have made videos explaining time dilation due to travelling close to the speed of light, nobody has tried to visualise how the universe appears to warp due to relativistic aberration. I wanted to create these visuals to give you an idea of what it would look like at these speeds, even without a warp drive or hyperspace nothing looks right. Travelling At 99% of The Speed Of Light Looks Strange - Project Hail Mary's Space Warp | 11:09 Scott Manley | 1.87M subscribers | 168,417 views...

Explanation: Solar System bodies make deep space exploration more fuel efficient! Today’s video shows the Psyche spacecraft gaining speed and changing its trajectory with minimal fuel spent due to a gravity assist from Mars in May 2026. Mars has an average orbital speed of almost 87,000 km/h (54,000 mph) around the Sun. Its orbital motion and its gravity allowed Mars to pull Psyche along with it, increasing the spacecraft’s speed. Gravity assists have been used since 1959’s Luna 3 mission to allow for spacecraft (the Voyagers, Cassini) to reach farther than they could with fuel alone. This assist helped the...