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The interstellar comet 3I/ATLAS is carrying water 40 times heavier than Earth’s oceans — and astronomers say it was born somewhere far colder than our sun

Somewhere in the galaxy, in a place colder than anything our solar system has ever produced, a ball of ice took shape.
Delco Times

Astronomer’s Notebook: Mercury, the elusive innermost planet

The most impressive feature on Mercury is the Caloris Basin, a vast, multi-ringed crater over 800 miles across, which is ...

Mercury's water ice may have been deposited by a larger, slower impactor than previously thought—in only one day

The source of the significant water ice deposits hidden in Mercury's polar regions has been a topic of debate among ...