explainer Physics
Gravity on Uranus: how strong is it compared with Earth?
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.
Browse the archive
Category: Space
explainer Space
How far can the human eye see? From the horizon to 2.5 million light-years
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: how strong is it compared with Earth?
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
White dwarf colours: most look white, a few would glow green or pink
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? Zero, and Mercury has none either
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.
explainer Space
Gravity on Venus: how strong is it compared with Earth?
Gravity on Venus is 8.87 m/s², about 90% of Earth's. See the NASA values, the GM/R² calculation, what you would weigh, and why Venus is still deadly.
explainer Astronomy
How long does it take to get to each planet? Real mission times
How long does it take to get to each planet? From 94 days to Venus to 12 years for Neptune: real NASA and ESA mission times, Hohmann math and gravity…
news Astronomy Evidence status: Peer reviewed · Observational study of one planet
JWST maps WASP-17b’s atmosphere: evening edge runs about 650 K hotter
JWST mapped hot Jupiter WASP-17b's atmosphere angle by angle: the evening edge is about 650 K hotter and puffier than the morning edge. How, and the catch.
explainer Astronomy
How long does it take to get to Mars? Mission times and the math
How long does it take to get to Mars? About 7 to 10 months. See NASA mission travel times, the Hohmann transfer math, launch windows and crewed trip estimates.