May 7, 2025 · Mercury Facts Mercury is the smallest planet in our solar system and the nearest to the Sun. Mercury is only slightly larger than Earth's Moon. It's the fastest planet, zipping around the Sun …

The exploration of Mercury has long had a minor role in the space interests of the world. It is the least explored inner planet. [1] As of 2025, the Mariner 10, MESSENGER, and BepiColombo missions …

Apr 25, 2025 · Mercury is the smallest planet in our solar system and nearest to the Sun. It's only slightly larger than Earth's Moon.

Nov 13, 2025 · The initial U.S. effort to launch a human into space was known as Project Mercury. It was carried out by NASA, which had been given that responsibility over air force objections. NASA …

Mercury is one of four inner planets in the Solar System. It is a terrestrial planet like Earth. It is the smallest planet in the Solar System, with a radius of 2,439.7 km (1,516.0 mi). [3] Mercury is even …

Sep 25, 2025 · The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments, like the MASCS instrument used to create this colorful …

Apr 25, 2025 · Because Mercury is so close to the Sun, it is hard to directly observe from Earth except during dawn or twilight when the Sun's brightness doesn't outshine little Mercury.

Sep 30, 2025 · The large, 400-kilometer-diameter (250-mile-diameter), impact basin Shakespeare occupies the bottom left quarter of this image from NASA's MESSENGER spacecraft.

Mercury Visible After Sunset - NASA https://www.nasa.gov/blogs/watch-the-skies/2011/03/17/mercury-visible-after-sunset NASA’s Mercury MESSENGER spacecraft is preparing to insert itself into …

May 9, 2025 · This high-resolution mosaic of images shows Mercury as it appeared to NASA's MESSENGER as it sped away from the planet... This mosaic of images taken on Oct. 6, 2008, by …