Scientists have long been puzzled by the presence of water ice on Mercury, the closest planet to the sun. New simulations suggest a massive impact similar to the one that formed Hokusai crater may have rapidly transported water across Mercury and locked much of it into permanently shadowed polar craters — all within the span of a single Mercurian day, or 176 Earth days.

Understanding how Mercury got its water ice can provide insights into the planet's geological history and the possibility of life on other planets. The discovery also has implications for future space exploration and the search for resources in our solar system.

"The idea that a single impact could have delivered water to Mercury's poles is a fascinating one," said Dr. Maria Rodriguez, a planetary scientist at NASA. "This research highlights the importance of continued exploration and study of our solar system's smallest planet."

• 3 times larger: The size of the sun in Mercury's sky compared to Earth's
• 42%: The percentage of Mercury's surface that is permanently shadowed

Mercury's proximity to the sun makes it an unlikely candidate for water ice. However, NASA's MESSENGER spacecraft discovered evidence of water ice in the permanently shadowed craters near Mercury's poles in 2011.

Further research is needed to confirm the theory and understand the implications for Mercury's geological history. The discovery also raises questions about the possibility of life on other planets and the search for resources in our solar system.

• Who: NASA scientists and researchers
• What: Proposed a new theory for the origin of Mercury's water ice
• Where: Mercury's permanently shadowed polar craters
• Impact: Provides insights into Mercury's geological history and the possibility of life on other planets

• NASA's James Webb Space Telescope has revealed a black hole that formed before its galaxy, challenging current theories on the origins of supermassive black holes.
• The 2026 Lunabotics Challenge has been won by a team of students from the University of Virginia, who designed and built a robotic system for lunar construction.
• A webinar on June 17, 2026, will discuss the use of NASA's Satellite Data Explorer for discovering, accessing, and tasking commercial Earth observation data.

As scientists continue to study Mercury and the origins of its water ice, we can expect new discoveries and a deeper understanding of our solar system. The search for resources and life on other planets will also continue, with implications for future space exploration and human settlement.