And in the past decade, more than 20 spacecraft have ventured into the deepest reaches of our solar system. These probes ... sending back pictures that humble or awe, even as they advance ...

The relative size of the inner planets of our solar system: Mercury, Venus, Earth and Mars. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!

Solar Orbiter just delivered its most jaw-dropping image yet—an enormous, detailed snapshot of the Sun's blazing outer ...

The James Webb Space Telescope has captured its first direct images ... pretty big implications," Balmer said. "If you have these huge planets acting like bowling balls running through your solar ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is hidden in our solar system.