This interactive explains how astronomers measure the properties of light from faraway space objects to calculate their distance from Earth. Users click through a series of pages that explain the concepts step-by-step with illustrations and animations.
What is the Universe’s arrangement today? What did it look like at its birth? And how did we get from then to now? These are just some of the “Big Questions” astronomers are making headway answering.
On cloudless, moonless nights, the stars are so bright over the remote village of Sutherland, South Africa, that a person can walk by starlight alone. Learn more about the village’s Southern African Large Telescope (SALT).
Scientists have been studying brown dwarfs, or failed stars, for nearly a century. What have they learned? And what answers are they still seeking about these objects stuck somewhere between stars and planets?
Two teams working independently in 1998 came to the same conclusion: An invisible force, one that seems to act opposite gravity, is separating the matter in space at an increasing pace. Find out more about their “jaw-dropping” discovery.
If LIGO regularly registers gravitational waves, it will more than vindicate Einstein. The observatory may help answer pressing questions about the cosmos’s biggest mysteries, among them black holes, dark matter, and the Big Bang.
Anything with an accelerating mass has a gravitational effect — an atomic bomb, a spinning aircraft carrier, even you. Learn more about these ripples in space and how LIGO is designed to capture the biggest gravitational waves.
LIGO, or the Laser Interferometer Gravitational-wave Observatory, is just one of five large-scale gravitational-wave detectors in the world. Find out how they rely on each other to achieve their goals.
Our eyes can only detect a fraction of light in the electromagnetic spectrum — otherwise we’d see gamma-ray bursts, flashes that outshine the sun by a million trillion times, about once a day. Learn more.
Discover how the geological and climatic changes that have unfolded over millions of years in Vietnam have set the stage for an extraordinary richness of biodiversity.