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Seth Borenstein

Global warming shifting Earth’s wobble

WASHINGTON—Global warming is shifting the way the Earth wobbles on its polar axis, a new NASA study finds.

Melting ice sheets, especially in Greenland, are changing the distribution of weight on Earth.

And that has caused both the North Pole and the wobble, which is called polar motion, to change course, according to a study published Friday in the journal, “Science Advances.”

A good chance to wish upon a shooting star: Moonlight won’t mess up this week’s meteor shower

WASHINGTON — Want to wish upon a shooting star? The skies over the United States are likely to co-operate for a meteor shower overnight Wednesday.

Astronomers say the lack of moonlight will help people see more of the oldest meteor shower known to Earth, the Perseids (pur-SEE’-uhdz).