This month's featured images include a commemorative portrait of the spacecraft Cassini and a composite image of dark matter.
Abigail Malate, Staff Illustrator
A team of scientists develop a model that describes the accelerating expansion of the universe without the need for mysterious dark energy.
Ramin Skibba, Contributor
Saturn's rings, Mars' geology and an artist's depiction of distant new worlds were among this month's most captivating space images.
Access to a dark night sky is a universal human right, says the American Astronomical Society
A stellar explosion in the constellation Cygnus could be visible to the naked eye.
Pioneering astronomer who discovered observational evidence of the existence of mysterious dark matter in the universe dies at 88.
Yuen Yiu, Staff Writer
Clouds above giant planet beyond our solar system are made from the same mineral as rubies and sapphires.
Charles Q. Choi, Contributor
Massive pulse gave off more energy than the sun emits in a month.
Observations of rotating galaxies could be explained without including dark matter, which may require changes to prevailing theories.
Inside Science is an editorially independent news service of the American Institute of Physics