The Seli’š Ksanka Qlispe’ Dam provides enough electricity for about 147,000 homes in the Flathead Indian Reservation in Montana.
Martina Nolte via Wikimedia Commons
How does flowing water make electricity? An engineer explains hydroelectric generation.
Thousands of galaxies seen by the James Webb Space Telescope.
The theory of gravity may need to be altered.
Strangely behaving matter could one day explain some of the mysteries of space.
Spiral galaxies like M100, pictured here, may hold answers about the nature of dark matter.
NASA Spitzer Space Telescope/NASA/JPL-Caltech
A comparison of star-forming galaxies suggests, surprisingly, that dark matter and visible matter do interact – taking us closer to understanding what keeps the galaxies together.
VFTS 243 is a binary system of a large, hot blue star and a black hole orbiting each other, as seen in this animation.
Astronomers have discovered the first dormant black hole outside of the Milky Way. These black holes are not absorbing matter from a nearby star, making them incredibly hard to find.
The barred spiral galaxy UGC 12158.
Recent results cast doubt on dark matter.
What happens to pilots’ bodies when they fly at breakneck speeds.
This image shows Sagittarius A*, the black hole at the center of the Milky Way galaxy.
Sagittarius A* is a massive black hole at the center of the Milky Way. Now that astronomers have imaged it, they can begin to learn more about black holes within other galaxies across the universe.
Ski jumpers use aerodynamics and physics to overcome gravity – at least for a while.
AP Photo/Matthias Schrader
Ski jumpers do everything they can to counteract the effects of gravity and fly as far as they can down hills.
Concept of a black hole acting as a lens on background light.
Some black holes are isolated in space and therefore near impossible to detect.
Bobsled, luge and skeleton athletes descend twisting, steep tracks at speeds upward of 80 mph (130 kmh).
AP Photo/Sergey Ponomarev
It may look like athletes in bobsled, luge and skeleton simply grab a sled and hang on until the bottom, but high-speed physics and tiny motions mean the difference between gold and a crash.
The locations of 115 candidate free floating planets in the region between Upper Scorpius and Ophiuchus.
European Southern Observatory
Some planets are rejected by the Solar System that gave birth to them.
Some stars travel at high speeds through the universe and sometimes leave spectacular clouds of dust and gas in their wake.
NASA, ESA and R. Sahai (NASA's Jet Propulsion Laboratory)
Hypervelocity stars were discovered only 15 years ago and are the closest things in existence to real shooting stars. They travel at millions of miles per hour, so fast that they can escape from galaxies.
Experiments at the Large Hadron Collider in Europe, like the ATLAS calorimeter seen here, are providing more accurate measurements of fundamental particles.
Physicists know a lot about the most fundamental properties of the universe, but they certainly don’t know everything. 2021 was a big year for physics – what was learned and what’s coming next?
An artist’s impression of the Double Pulsar system in which the two pulsars orbit each other every 2.5 hours and send out high-energy beams that sweep across the sky.
Image credit: John Rowe Animations/CSIRO
Astronomers watched a pair of pulsars for 16 years to test the theory of general relativity, which has stood unchallenged for over a century.
A telescope in the outer solar system would be able to do unique science that is impossible closer to the Sun.
Such a mission could be developed soon, allowing astrophysicists to take selfies of the solar system and use the Sun’s gravity as a lens to peer deep into space.
The Earth is round.
Alistair Berg/DigitalVision via Getty Images
Gravity, mass and centrifugal force all contribute to the final shape of a planet.
Gravity feels like it’s pulling everything toward Earth, but why?
AdventurePhoto/E+ via WikimediaCommons
Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.
The reason bigger objects in space are round and smaller ones aren’t boils down to gravity. And it’s the same reason mountains on Earth can only grow to a certain height
The English astronomer and navigator Thomas Harriot died in 1621, leaving behind 8,000 pages of notes containing a trove of unpublished scientific discoveries.