Universe

There is no permanently dark side of the Moon. The far side gets sunlight just like the near side — we simply don’t see it from Earth because the Moon is tidally locked, taking about as long to spin once as it does to orbit us once.

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We think of astronauts as floating in zero gravity, but the International Space Station is still deep inside Earth’s pull, where gravity is nearly 90% as strong as it is on the ground. What looks like weightlessness is really the station and its crew falling around the planet at about 28,000 kilometres per hour.

The Apollo astronauts who carried lunar dust back into the cabin kept making the same strange report — fresh Moon dust smelled like spent gunpowder — yet the smell never survived the trip home, and more than fifty years later no one has fully explained what they were breathing in up there.

At least two trillion galaxies fill the observable universe — ten times the old estimate — and most are too faint for any telescope today to see, a 2016 study found

SpaceX Falcon 9 rocket launches 24 Starlink satellites into low Earth orbit from California

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A lunar meteorite found in northwest Africa has been shown to record evidence of an asteroid impact on the Moon 3.5 billion years ago, matching independently dated impacts on Earth and on the asteroid 4 Vesta from the same period, at the moment life on Earth was first taking hold

NASA will have to find a way to service its new alien-hunting space telescope

The universe might not be expanding as we thought, study says

Webb found a planet stretched into a lemon shape around a pulsar, with an atmosphere of carbon that seems to rule out every way we know of forming it

Astronauts aboard the International Space Station can see flashes of light even with their eyes closed — not from light entering the eye, but from high-energy space particles passing through their body and triggering the retina or visual pathway directly.

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Artemis III backup astronaut in prime spot to be chosen for moon landing mission

Last-minute launch issue delays critical NASA rescue mission

A probe called Cassini spent thirteen years orbiting Saturn, flew through the plumes of its moon Enceladus, tasted water and organic molecules in the spray, and then was deliberately crashed into Saturn’s atmosphere in 2017 so it could not contaminate what might be a living ocean

Some climate models suggest Venus could once have had liquid water and habitable temperatures, until a dramatic transformation hundreds of millions of years ago. One leading idea is that widespread volcanic resurfacing helped push the planet into the runaway greenhouse state that left it hotter than Mercury today.

Deep inside Neptune and Uranus the pressure is thought to crush carbon into diamonds, which then sink slowly through the planet as a glittering rain

Returning astronauts describe pain in the soles of the feet and lower back within days of landing — the spine suddenly forced to support half the body’s weight again after months of weightlessness

For the 2014 film Interstellar, director Christopher Nolan hired Caltech physicist Kip Thorne as his science consultant — and the visual simulations Thorne helped design for the film’s black hole were so mathematically accurate that they generated two peer-reviewed scientific papers and became the model for how astrophysicists visualize black holes today