Uncovering the mysteries of Mars' wet history, this week on Planetary Radio.

I'm Sarah Alahmed of the Planetary Society, with more of the human adventure across our solar system and beyond.

From fascinating new evidence of possible ancient megasyunamis on Mars to the discovery of opals and gale crater,

we're about to delve into some of the latest findings about Mars' watery past, with our guests this week, Mars expert Tanya Harrison.

Bruce Betz will join us to share more on what's in the night sky and what's up, and a special Mars rover prize in this week's Space Trivia contest.

There's some fun news from the Jovian system.

According to the Minor Planet Center, Jupiter now has 12 more confirmed moons, bringing the number of known moons orbiting the largest planet in our solar system to 92.

That means that Jupiter has finally taken the lead over Saturn's 83 known moons, for now.

The James Webb Space Telescope, or JWST, continues to capture mind-blowing data on objects both near and far, including observations of ChariClo, a 250 kilometer or 160 mile in diameter icy body, beyond the orbit of Saturn.

When ChariClo passed in front of a star, the telescope was able to detect its rings.

The rings were first observed by ground-based telescopes in 2013, and it's thrilling to get even more details on the ring system around this tiny planetary body.

JWST also captured images of a developing star system around a red dwarf star 32 light years away, called AUMIC.

The Space Telescope was able to show the debris disk around the star in two different wavelengths of infrared light.

AUMIC already has two known planets, and the disk is the result of collisions between the remaining planet forming materials in the system.

You can find these JWST images, info on these stories, and more in the February 3rd edition of the downlink, the planetary society's weekly newsletter.

You can read it or subscribe to have it sent to your inbox for free every Friday at planetary.org slash downlink.

Discovering the history of water on Mars has been a captivating journey for scientists.

Over the years, various missions and experiments have helped build a more complete picture of the planet's watery past.

From early observations of ice on the surface to more recent findings of subsurface ice, and even the potential for flowing water, each new discovery has added to our understanding of the role that water has played on Mars.

In 2016, a NASA-funded research project showed that two potential megasynami events in Mars' watery past could have played a role in forming Martian coastal terrain.

It was an exciting finding that was followed up by a recent paper published in December in the Journal of Scientific Reports, saying that a newly discovered impact crater on Mars, called poll, may have caused one of these two megasynami events.

It's estimated that poll crater was created with an asteroid about three to nine kilometers, or 1.9 to 5.6 miles across, slammed into Mars 3.4 billion years ago.

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