Callisto, the third largest moon in the entire solar system, orbits Jupiter from about 1.2 million miles away. The rocky ...
"It feels like something out of science fiction," said European Southern Observatory astrophysicist Julia Victoria Seidel.
In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...
As more satellites, telescopes, and other spacecraft are built to be repairable, it will take reliable trajectories for ...
Learn about the life and scientific contributions of Johannes Kepler, the 17th-century astronomer known for his laws of ...
In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...