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news Astronomy Evidence status: Peer reviewed · Single event
A 1.7-second gamma-ray flash and a 51-second burst, 4 minutes apart from one spot, test as merger and collapsar types. What GRB 160425A shows, and its limits.
news Astronomy Evidence status: Peer reviewed · Observational study
Keck spectra show two faint star-forming galaxies near a near-pristine gas cloud from 2 billion years after the Big Bang. The link is inferred, not proven.
explainer Astronomy
How hot is the Sun? The surface is 5,772 K (5,499 °C, 9,930 °F), the core about 15.7 million K and the corona 1 to 2 million K. See how…
explainer Physics
Gravity on Europa is 1.31 m/s², about 13% of Earth's and 81% of the Moon's. See NASA data, the GM/R² maths, what you'd weigh and why it matters for plumes.
explainer Physics
Gravity on Uranus is 8.69 m/s² at the equator, about 0.89 of Earth's, even with 14.5 Earth masses. See NASA's values, the GM/R² maths and what you'd weigh.
explainer Space
On flat ground the horizon is about 4.7 km away, but on a dark night you can see the Andromeda Galaxy 2.5 million light-years off. Here is why.
explainer Physics
Gravity on Neptune averages 11.27 m/s², about 1.15 times Earth's, despite 17 Earth masses. See NASA values, the maths and what you would weigh there.
news Astronomy Evidence status: Peer reviewed · Calculated colours from existing spectra and models
Nearby white dwarfs look white on average, Warwick astronomers calculate, but about 1 in 30 would look yellow or pink, and one known star would look green.
explainer Astronomy
How many moons does Venus have? None, and Mercury has none either. See NASA's moon counts for every planet and why the Sun and tides leave both moonless.
