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EarthSky’s Dave Adalian talks with astrophysicist David Rubin about new evidence that dark energy might evolve over time. Type Ia supernovae let us precisely measure cosmic distances, and gave us

This is Apep, a multiple star system in the direction of the small, southern constellation Norma. Apep is named for an ancient Egyptian deity (Apep, aka Apophis), the embodiment of

Here we present 10 cool things about stars! 1. Every star you see in the night sky is bigger and brighter than our sun Of the 5,000 or so stars

View larger. | Artist’s concept of TOI 1227 b. The baby exoplanet, about the size of Jupiter, is gradually losing its atmosphere and shrinking in size due to intense X-ray

Comet 3I/ATLAS imaged by the Gemini North telescope. It reveals the comet’s compact coma. That’s the cloud of gas and dust surrounding its icy nucleus. But what if – as

View larger. | A fluvial sinuous ridge, or inverted channel, in Noachis Terra on Mars. A new study has identified over 9,300 miles (15,000 km) of these ancient rivers on

Artist’s concept of a supermassive black hole shredding and devouring a star in what’s known as a tidal disruption event. Astronomers have spotted a star that suffered this fate but

View larger/ full image. | European Southern Observatory’s Very Large Telescope (VLT) in Chile took this image of the young, massive exoplanet HD 135344 Ab. It is only about 12

Artist’s impression of the long-period radio transient CHIME J1634+44, which has properties so strange it’s been described as a “unicorn” object. Image via NSF/ AUI/ NSF NRAO/ P.Vosteen. The National

View larger. | The image to the left, taken with ESO’s Very Large Telescope (VLT), shows a possible newborn planet (circled) around the young star HD 135344B, located around 440