Five planets are retrograde in summer 2025: Pluto, Neptune, Saturn, Mercury and Uranus. Astrologically, that means in for a ...

Mercury will retrograde from Dec. 13 through Jan. 2 in the last of four times it appears to move backward in the sky this year. Every planet has in our solar system has retrograded for at least ...

The $446 million Messenger (MErcury Surface, Space ENvironment, GEochemistry and Ranging) spacecraft launched in 2004. It then took a circuitous route to the solar system's innermost planet ...

Mercury is the closest planet to the sun and the smallest planet in our solar system.With a diameter of about 3,032 miles (4,880 kilometers), Mercury is less than half the size of Earth, which is ...

Named for the fleet-footed Roman messenger god, Mercury is the closest planet to the sun, zipping around our parent star at an average of 36 million miles away. However, Mercury’s orbit is not a ...

But Mariner 10 imaged only 45% of the planet, and scientists could account for only about 0.5 to 2 miles of shrinkage in the radius. The models said that Mercury’s radius should have shrunk ...

Mercury is the closest planet to the sun and the smallest planet in the solar system. Here we explore the strange world in more detail. Skip to main content. Open menu Close menu.