In March 2025 we have a fine opportunity to view the planet that many astronomy guide books refer to as the most difficult of ...

Astronomers have identified a quartet of small rocky planets orbiting Barnard's star - one of our closest stellar neighbors - ...

March brings thrilling celestial events, including a rare chance to spot Mercury, a stunning total lunar eclipse, and ...

Explore facts about our solar system's fastest planet. Mercury is slightly larger than our Moon - 15,329 kilometres around its equator. Its radius, the distance from the core's centre to the surface, ...

Between Mercury and Saturn, the former is closer to Earth than the ringed gas giant. Mercury’s rocky surface, when facing the sun, can reach highs of 800 degrees while overnight lows could reach ...

Caption This is an image of Mercury's tail obtained from combining a full day of data from a camera aboard the STEREO-A spacecraft. The reflected sunlight off the planet's surface results in a ...

The Mercury flyby of the MESSENGER (Mercury surface, space environment, geochemistry and ranging) probe was the first of three braking manoeuvres for the spacecraft, in preparation for its ...

Interestingly, the time it takes Mercury to rotate once on its axis is 59 days, so that all parts of its surface experiences periods of intense heat and extreme cold. Although its mean distance ...