Real HD photos and videos taken by the MESSENGER probe. We discuss the orbit, climate, geographical features, and general physical characteristics or Mercury, and a lot more. Astrum ...

Our solar system: the Sun; inner planets Mercury, Venus, Earth, and Mars; ... Triple sunset in the star system HD 188753, about 900 trillion miles away. Credit: JPL-Caltech / NASA / R. Hurt.

They’re not a perfect match, but it’s way too hot on the first planet for us to hop over and confirm for ourselves.

Some scientists think Mercury formed farther from the Sun and moved inward later in the solar system’s history. This inner world’s proximity to the Sun makes it difficult to observe and study.

While the video of Mercury’s transit across the Sun is breathtaking. The small planet even appears as a black disk silhouetted against the bright solar star that our solar system is centered around.

With a total volume little more than the Moon, it is the smallest planet in the Solar System and is situated the closest to the Sun. Mercury has no atmosphere to retain heat, meaning that the ...

Astronomy enthusiasts will have the chance to gaze up at a rare planetary parade on Tuesday as five planets of the solar system align. Mars, Venus, Jupiter, Mercury and Uranus should be visible ...

The next Mercury retrograde will happen from August 4 to August 27 and the next total solar eclipse that can be seen from the U.S. won’t happen for another two decades — on Aug. 23, 2044 ...