A European-Japanese spacecraft has beamed back some of the best close-up photos yet of Mercury's north pole as part of only the second human survey of our solar system's innermost planet. The ...

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

The image features Mercury’s terminator—the separation ... Those eternally dark areas are some of the coldest places in the solar system, despite the fact that Mercury is the closest planet ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Europe and Japan’s BepiColombo beamed back close-up images of the solar system’s innermost planet, flying through Mercury’s shadow to peer directly onto craters that are permanently hidden ...

Mercury takes only 88 Earth days to orbit the sun.

Understanding Mercury can help scientists understand Earth and how the rocky planets of the inner solar system formed. The BepiColombo flyby images are a tantalizing preview of the science yet to ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

It seems like it should be pretty easy to get to Mercury. The little rocky planet ... difficult to reach the innermost planet of our solar system—which makes it that much more impressive that ...