Space, Earth and the natural world, explained.
A line of moving lights across the night sky is almost always a fresh batch of Starlink satellites. Here is when they show up, how to predict a pass and why the show is short.
NOAA's Space Weather Prediction Center publishes free aurora forecasts that look technical at first. Three numbers and one map tell you most of what you need.
Planets move through the sky from month to month, so the answer changes. Here is how to work out what is up tonight and how to tell a planet from a bright star.
A date-by-date list of the solar and lunar eclipses Americans can see over the coming years, based on NASA's eclipse tables, plus how to watch each kind safely.
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