We tend to think of gravity as being about as constant as it gets. It is the invisible anchor that keeps our feet on the ground and the oceans in their beds. But if you look closely enough — and deep enough — it’s not constant at all.

Plus NOAA's GOES-19 satellite spies the lunar disk crossing the face of our parent star.

Pink boulders led scientists to a massive granite formation buried under Antarctica’s ice, solving a decades-old geological mystery.

Early on Tuesday, Feb. 26, a rare annular solar eclipse created a “ring of fire” over Antarctica, while South Africa and Indian Ocean locations saw partial phases.

A video is spreading on social media with claims that Elon Musk's Starlink internet service enabled a livestreamer to show Antarctica's "legendary 'ice wall'" -- a reference to the debunked flat-Earth conspiracy theory.

After accounting for Earth’s rotation, gravity is slightly weaker beneath Antarctica than anywhere else on the planet. That weakness creates a kind of “gravity hole,” a broad low in the field that helps shape the sea surface around the southern continent.

A better understanding of the bedrock can help researchers calculate how quickly the continent's melting glaciers might affect sea-level rise

The simulations showed that the gravity hole was initially much less pronounced. Between roughly 50 million and 30 million years ago, however, it intensified significantly. This period coincides with major shifts in Antarctica’s climate, including the beginning of widespread glaciation across the continent.

Forte and colleagues now believe Antarctica’s gravity hole was weaker before eventually intensifying around 30 to 50 million years ago. This corresponds to large-scale changes in the continent’s climate that included the arrival of glaciers. These, in turn, exert major influences on Earth’s ecosystems, including sea levels and ocean acidity.

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