Artemis I moon rocket is a step nearer to launch countdown

The most powerful rocket NASA has ever built, the Space Launch System is now ready for a final prelaunch test for the uncrewed Artemis I mission. Known as a wet dress rehearsal, the trial includes loading the fuel tanks and conducting a launch countdown.

Ultimately, the plan is to use the 322-foot (98-meter) rocket to land the first woman and person of color on the moon. The SLS will usher in a new era of deep space exploration.

But even as NASA reaches for the stars, I was struck this week by how much of Earth’s surface still remains uncharted and how dramatically it can change without us knowing.

I’m Katie Hunt, standing in for Ashley Strickland in this edition of Wonder Theory.

Ocean secrets

Marine scientists have discovered deep sinkholes — one larger than a city block of six-story buildings — and ice-filled hills that have formed “extraordinarily” rapidly on a remote part of the Arctic seafloor.

Mapping of Canada’s Beaufort Sea revealed the dramatic changes, which the…

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