A new notification system is being proposed at access points along the Chicago River to warn recreational users when untreated wastewater has entered the waterway.

The images and other information released Wednesday by the European Space Agency’s Euclid observatory includes a preview of three cosmic areas that the mission will spy in finer detail, mapping the shapes and locations of galaxies billions of light years away.

On Wednesday and Thursday, the forecast for Chicago includes a chance of almost anything and everything: rain, thunderstorms, wind and even snow.

A group of microscopic sunflower sea star larva arrived at Shedd Aquarium last year and have been bulking up behind the scenes ever since. Now, after growing 16,000%, they’re ready to make their public debut.

A high wind warning is in effect for Chicago through noon on Saturday, with the potential to bring down trees and power lines, according to the National Weather Service.

This week’s lunar eclipse will be the first witnessed in high-def from the moon itself — technically a solar eclipse on the moon — thanks to a lunar lander. “I cannot wait for this to happen,” said astronomer Michelle Nichols of Adler Planetarium.

The decades-old St. Patrick's Day tradition routinely attracts tens of thousands of revelers to the riverfront, but in recent years it's also attracted criticism from environmentalists.

Brian Gladstein, a long-time Rogers Park resident with an extensive background in nonprofit management, will lead the organization into its 50th year.

The dump — known as a confined disposal facility — was constructed in 1984 to store polluted sediment dredged from the Calumet River and Cal-Sag Channel. When it reached capacity, the initial plan was to top off the 45-acre site and turn it over to the Chicago Park District. Instead, the Army Corps proposed a 22-foot vertical expansion that would extend the dump’s life for another 20 years.

The monarch butterfly population has rebounded from a near record low number in 2024, according to the latest annual survey conducted by the World Wildlife Fund-Mexico.

Clocks will officially move ahead one hour at 2 a.m. Sunday, but President Donald Trump has called Daylight Saving Time “inconvenient, and very costly.”

In a lot of ways, the history of the North American beaver is interwoven with the history of Chicago.

From December 2024 through February 2025, Chicago notched less than a foot of snow.

After a career in city government spanning 35 years and five mayoral administrations, Rosa Escareño, general superintendent and CEO of the Chicago Park District, announced her resignation Wednesday.

The donation is one of the largest to the aquarium in recent history, according to Shedd.

In just a handful of decades, the rusty crayfish has become dominant in the Great Lakes. Join us on a deep dive into this elusive invader.