A NASA satellite launched in 1976 carries a Carl Sagan–designed plaque sealed inside its core, mapping Earth’s continents 268 million years ago, at launch, and 8.4 million years from now — and that last date is no accident, because it’s roughly when the satellite is expected to fall back to Earth and finally be opened.

On 4 May 1976, NASA launched a satellite called LAGEOS-1 from Vandenberg Air Force Base in California. It is one of the simplest objects ever put into orbit. It is a sphere about 60 centimetres across, weighing roughly 400 kilograms, with no electronics, no sensors, no power source, and no moving parts. It is a […]

Webb just clocked nearly 9,000 young star clusters and found the biggest ones break from their birth clouds in 5 million years, a timing clue that could reshape how astronomers model galaxies growing up

The James Webb Space Telescope has given astronomers a sharper look at how young star clusters escape their birthplaces, and the result cuts against the simple intuition that smaller clusters should clear out faster. In a Nature Astronomy study, researchers used Hubble and Webb observations of thousands of young star clusters in four nearby galaxies […]

Titan’s atmosphere is thicker than Earth’s, its rivers and lakes are made of methane and ethane, and NASA is sending a nuclear-powered drone there because on Saturn’s largest moon, flying may be easier than driving.

Titan, the largest moon of Saturn, has a denser atmosphere than Earth and a surface where rain, rivers, and seas are made of liquid hydrocarbons rather than water. And NASA is building a rotorcraft to explore it, because Titan’s physical conditions genuinely favour flight in a way no other body in the solar system does. […]