Scientists believe Earth may have briefly lost protection from the sun around two million years ago, left to endure the extreme environment of interstellar space as the solar system passed through a dense cloud of gas and dust between stars. At that time, early human ancestors shared our planet with prehistoric animals like mastodons and […]
The Pleistocene Epoch—with its glaciers, woolly mammoths, and Neanderthals—still looms large in Earth’s rearview mirror, having ended a mere 12,000 years ago. Now, a team of researchers posit that those hundreds of thousands of years of our planet’s history may have been chilly due to a cloud in space that briefly removed Earth from the […]
The Sun warms the Earth, making it habitable for people and animals. But that’s not all it does, and it affects a much larger area of space. The heliosphere, the area of space influenced by the Sun, is over a hundred times larger than the distance from the Sun to the Earth. The Sun is […]
I was once sitting with my father while Googling how far away various things in the solar system are from Earth. He was looking for exact numbers, and very obviously grew more invested with each new figure I shouted out. I was thrilled. The moon? On average, 238,855 miles (384,400 kilometers) away. The James Webb […]
I was once sitting with my father while Googling how far away various things in the solar system are from Earth. He was looking for exact numbers, and very obviously grew more invested with each new figure I shouted out. I was thrilled. The moon? On average, 238,855 miles (384,400 kilometers) away. The James Webb […]
The largest planetary construction site ever seen, spanning hundreds of billions of miles in size, may very well be cast in an enormous shadow that accentuates its bizarre appearance. In short, it looks like a cosmic butterfly — and, for years, it was ignored. The object, known as IRAS 23077+6707, was originally cataloged as a […]
The Dark Energy Camera (DECam) has captured an ominous and ghostly hand reaching from the Milky Way from a distant edge-on spiral galaxy. But don’t panic; despite its nickname, “God’s Hand,” there is nothing supernatural about this structure — yet that doesn’t make it any less awe-inspiring. God’s Hand is actually a cometary globule […]
After working for five months to re-establish communication with the farthest-flung human-made object in existence, NASA announced this week that the Voyager 1 probe had finally phoned home. For the engineers and scientists who work on NASA’s longest-operating mission in space, it was a moment of joy and intense relief. “That Saturday morning, we all […]
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A new study casts more doubt on the supposed success of an interstellar fishing expedition. On Jan. 8, 2014, a space rock about 1.6 feet (0.5 meters) wide exploded over the western Pacific Ocean. In 2019, Harvard astronomer Avi Loeb and his colleague Amir Siraj determined that the intruder came from outside our solar system, […]
How do you tell the difference between a spaceship and a space rock? For astronomers like me, this question has proved tricky — so tricky that we were very nearly fooled when the first recorded interstellar object, named ‘Oumuamua, was spotted passing through the inner solar system in 2017. Astronomers once thought that any object […]
On Dec. 12, 2023, NASA shared some worrisome news about Voyager 1, the first probe to walk away from our solar system‘s gravitational party and enter the isolation of interstellar space. Surrounded by darkness, Voyager 1 seems to be glitching. It has been out there for more than 45 years, having supplied us with a […]