Mercury is tiny, barely bigger than the Moon. Its metallic core makes up 70% of the planet’s mass, vastly exceeding Earth’s ...
Astronomy on MSN
October 2025: What's in the sky this month? Mercury and Mars meet, Titan transits Saturn, and the Orionid meteor shower dazzles
October's longer nights bring two transits of Titan across Saturn, while Io and Europa tango together across Jupiter three times. Mercury and Mars make a brief evening appearance, and Venus dominates ...
A new study rules out the existence of global oceans of water on Neptune-like planets such as K2-18b, finding their water ...
Today In The Space World on MSN
First Real Images of Mercury Reveal the Unexpected
Mercury is small, but full of surprises. Discover its frozen poles, strange craters, and active magnetic field in this deep dive into the closest planet to the Sun.
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