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A mosaic image of Titan's liquid methane and ethane seas. Photo: JPL-CALTECH / NASA / ASI / USGS

The most complete map to date of Saturn’s moon Titan reveals a mountainous world with a network of liquid methane and ethane lakes and seas connected by underground rivers, writes Lisa Grossman for Science News. Scientists already knew that Titan had something like Earth’s water cycle, but with methane. This is the latest finding from the Cassini mission to show the startling geological complexity of the hazy, gassy moon.

Why it matters: Scientists are very interested in Titan’s geology because they believe the hydrocarbon-rich planet has the potential to support some form of life. An interconnected water system, like the one on Earth, could influence the way any such life would develop. “Looking for actual evidence that the lakes could be communicating was a fundamental question from Cassini,” study coauthor Alexander Hayes tells Grossman, “This is the final paper that gives the best evidence that it exists.”

What they did: When Cassini flew over Titan 13 years ago, the robot scanned the planet and measured elevation. They used radar to identify lakes, seas and mountain ranges.

What they found: When they analyzed the altitude of Titan’s largest bodies of liquid methane, they found they were all at about the same level, like sea level on Earth. For them to stay level, they need to be connected. The map also details mountain ranges across the planet, including the southern hemisphere, and reveals high-altitude dry lakebeds that could be sinkholes or the remnants of volcanoes.

What’s next: The map, which was published December 2 in the journal Geophysical Research Letters, will likely be used by other scientists studying the Saturnian moon’s geology. “Within hours of the paper actually being available online, people we’ve never collaborated with started contacting [Hayes’ co-author, Paul Corlies] to ask how to get the data,” Hayes told Grossman.

Go deeper

By the numbers: Leaving House

Expand chart
Data: House Press Gallery; Table: Danielle Alberti/Axios

Rep. Anthony Brown (D-Md.) is the latest House lawmaker to announce he won't seek re-election next year, bringing the total number of Democratic retirements to 13, compared to nine Republicans.

Why it matters: The increasing number of Democratic retirements — put against the backdrop of President Biden's sagging approval ratings and uncertainty about redistricting — is adding to concerns the party may not be able to keep its slim majority in the House.

Ohio sues Biden admin over reversal of Trump-era abortion referral ban

Ohio Attorney General Dave Yost. Photo: Justin Merriman/Getty Images

Ohio Attorney General Dave Yost filed a lawsuit against the Biden administration Monday over a Trump-era ban on abortion referrals that President Biden overturned earlier this month.

The big picture: The lawsuit aims to reinstate two measures included in the 2019 legislation that required federally funded family planning clinics to be "financially independent of abortion clinics," and refrain from referring patients for abortions.

Oklahoma Supreme Court temporarily blocks abortion restrictions

A pro-choice activist demonstrates outside the U.S. Supreme Court on Oct. 4, 2021. Photo: Stefani Reynolds/Bloomberg via Getty Images

The Oklahoma Supreme Court on Monday temporarily blocked three abortion restrictions set to take effect on Nov. 1.

Why it matters: The laws would place new limits on medication-induced abortions and require doctors who perform abortions to attain board certification in obstetrics and gynecology.