A new study finds the shrinking Caspian Sea is due to a combination of human activity and climate change. A major factor is less inflow from the Volga River.
Boötes the Herdsman is a large constellation that holds one of the brightest stars in the sky, Arcturus. Only 3 other stars in the night sky are brighter.
The Mars Express orbiter caught this view of the red planet, which is peppered with whirlwinds. Can you spot the 34 dust devils on Mars in this 1 shot?
New simulations suggest our nearby universe could contain many dark galaxies, containing dark matter but no stars. And our radio telescopes could detect them.
Airglow is a light that occurs high in Earth's atmosphere. It's usually too dim to see with the eye, but photographers can capture glorious photographs of it.
Kelly Kizer Whitt writes and edits some of the most fascinating stories at EarthSky.org. She's been writing about science, with a focus on astronomy, for decades. She began her career at Astronomy Magazine and made regular contributions to other outlets, including AstronomyToday and the Sierra Club. She has nine published books, including a children's picture book, Solar System Forecast, and a young adult dystopian novel, A Different Sky.