We see objects whose light only arrives just now. But we see them as they were in the past: when that now-arriving light was first emitted.
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Is gravity weaker over distances of billions of light-years?
Rocks and minerals don’t simply reflect light. They play with it and interact with light as both a wave and a particle.
The Universe has been creating stars for nearly all 13.8 billion years of its history. But those photons can’t match the Big Bang’s light.
The Lyman-α emission line has never been seen earlier than 550 million years after the Big Bang. So why does JADES-GS-z13-1-LA have one?
During the industrial era the cost of artificial light fell off a cliff — and the road to illumination was paved with ingenuity and slaughter.
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
Just 13.8 billion years after the hot Big Bang, we can see objects up to 46.1 billion light-years away. No, this doesn’t violate relativity.
Yes, the Universe is expanding, but if you’ve ever wondered, “How fast is it expanding,” the answer isn’t in terms of a speed at all.
A simple dice game shines a bit of light on the psychology of regret.
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
With LEDs bringing brighter nighttime lighting than ever before, and thousands of new satellites polluting the skies, astronomy needs help.
The Extremely Large Telescope (ELT) will have a light-collecting power 10 times greater than today’s best telescope.
Without wormholes, warp drive, or some type of new matter, energy, or physics, everyone is limited by the speed of light. Or are they?
Northern lights in the American South, clusters of huge geomagnetic storms—the Sun is throwing a tantrum right on schedule.
Light can be turned into heat, which can then be turned into motion, and the effect of that motion can be turned into a big squeeze.
Most waves need a medium to travel through. But the way that light and gravitational waves travel shows that space can’t be a medium at all.
In 2017, a kilonova sent light and gravitational waves across the Universe. Here on Earth, there was a 1.7 second signal arrival delay. Why?
Just 460 light-years away, the closest newborn protostars are forming in the Taurus molecular cloud. Here are JWST’s astonishing insights.
A new measurement offers insights on the density of the mysterious force driving the Universe’s expansion.
Scientists are searching for dark matter particles that are trillions or even quadrillion times lighter than the more traditional searches.
Invisible cloaks. Ghost imaging. Scientists are manipulating light in ways that were once only science fiction.
With the discovery of Porphyrion, we’ve now seen black hole jets spanning 24 million light-years: the scale of the cosmic web.
Studying why innovation clusters form can shed light on how to better promote research and growth.
Although the Big Bang occurred at an instant in time long ago, we still see the light from it. Will the evidence ever disappear completely?
The most iconic “dark nebula” of all lights up under JWST’s infrared gaze. Here’s what’s newly discovered inside.
By focusing on the role of human experience, we may uncover new insights on the fundamental structure of reality.
From inside our Solar System, zodiacal light prevents us from seeing true darkness. From billions of miles away, New Horizons finally can.
When we see pictures from Hubble or JWST, they show the Universe in a series of brilliant colors. But what do those colors really tell us?