Astronomy
Planet Nine Is Put on Trial in Absentia
Breathless media coverage notwithstanding, the cases for and against a hypothetical Planet Nine in the outskirts of the solar system remain inconclusive.
If ET Calls, Think Twice About Answering
Why some say searching for ET is best done quietly.
Exoplanet Puzzle Cracked by Jazz Musicians
A system of seven Earth-like exoplanets appeared to be unstable. Now their orbits have been rewritten in the music of the spheres.
Opening a New Window into the Universe
New technology could bring new insights into the nature of black holes, dark matter, and extrasolar planets.
How to Use a Sphere to Talk to Mars
To avoid garbled messages, mathematicians might translate them into geometric form.
If You Can’t Find Dark Matter, Look First for a Dark Force
Physicists are rethinking how to use the Large Hadron Collider to search for dark matter.
Dark Matter Is Either Like Neptune or Like Vulcan
This isn’t the first time that scientists have wrestled with the unseen.
