Sunday is the shortest day of the year north of the equator, where the solstice marks the start of astronomical winter. It’s ...

Comet 3I/ATLAS is the third known interstellar comet after 2017's 1I/'Oumuamua and 2019's 2I/Borisov. It was discovered on July 1, 2025 and made its closest approach to the sun in October. Now it is ...

December 19, 2025, will be rather significant as this will be the very day that comet 3I/ATLAS will brush past the Earth for ...

On Sunday, Dec. 21, at exactly 10:03 a.m. EST, the Northern Hemisphere's astronomical winter officially begins with the ...

As of Thursday, Dec. 17, the moon phase is Waning Crescent. This means only 2% of the moon is lit up tonight, according to ...

Particles that escaped Earth’s atmosphere accumulated on the lunar surface over billions of years. Here’s what you’ll learn ...

The winter solstice marks the shortest day and longest night in the Northern Hemisphere. Here’s why it happens, what it means ...

Winter officially arrives at 10:03 a.m. EST on Dec. 21, bringing the year's longest night and shortest day. While astronomers ...

Geothermal energy delivers constant power using heat from beneath the Earth. Here’s how it works and why it matters.

For those north of the equator, the solstice on Sunday, Dec. 21, marks the shortest day and longest night of the year. During ...

The winter solstice marks the beginning of winter. Daylight will begin to increase after the solstice but the coldest ...