A new study, using Earth as a model, suggests alien civilizations should exist, but they would be few and very far between, making detection and communication extremely difficult.
The Curiosity Mars rover looks up from the martian surface to capture images of Earth and Venus in a bright twilight sky, showing humanity’s home as a tiny speck of light.
Before-and-after images of the spiral galaxy M100 were used in early 1994 to prove the Hubble Space Telescope’s flawed optics had been successfully repaired. More recent views with more powerful instruments show how Hubble has improved with age.
Astronomers have come up with another value for the Hubble constant, more evidence that the standard model of the cosmos and its expansion need revision
Researchers find evidence for an intriguing exoplanet in archived Kepler data, a “mirror-image” Earth-like world in the habitable zone of a Sun-like star.
Astronomers find no signs of first-generation population III stars in gravitationally lensed galaxies dating back to within 500 million years of the Big Bang.
The Chandra X-Ray Observatory caught an eight-solar-mass black hole in the act of spewing jets of gas into space , material ripped away from a companion star and accelerated up to 80 percent the speed of light