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President Donald Trump holds up an executive order. He signed dozens of executive orders on his first day in office, undoing many of his predecessor’s policies.

President Trump Orders the U.S. to Exit the World Health Organization and Paris Climate Agreement on His First Day in Office

The actions will take effect in a year, reinstating withdrawals he had set in motion during his first term

The Mauna Loa Observatory in Hawaii recorded the highest annual jump in atmospheric carbon dioxide levels since its records began in 1958.

Hawaiian Observatory Clocks Highest Annual Jump in Atmospheric Carbon Dioxide Since Its Records Began 67 Years Ago

The change measured by the Mauna Loa Observatory was likely driven by wildfires and continued burning of fossil fuels, scientists say

A view of the Palisades fire on January 9. The strong Santa Ana winds that fueled much of the L.A. wildfires’ destruction are expected to relax for a few days.

L.A. Fire-Fueling Winds Slow Down, Offering a Short Reprieve. What Are the Santa Ana Winds, and Why Do They Fan the Flames?

The seasonal gusts have exacerbated the deadly fires, and they’re expected to pick back up next week

A SpaceX Falcon 9 rocket lifted off from NASA's Kennedy Space Center on January 15, carrying two lunar landers built independently by private companies Firefly Aerospace and Ispace.

Two Private Landers Launch on a SpaceX Rocket, Aiming to Touch Down on the Moon

Built by Firefly Aerospace and Ispace, the pair of spacecraft will land separately in the moon’s northern latitudes, conduct science experiments and test new technology

An artist’s concept of a white dwarf orbiting a supermassive black hole and shedding matter

Astronomers Found Strange, Accelerating X-Ray Pulses Coming From a Black Hole. They Might Be a Sign of an Orbiting White Dwarf

The dense stellar remnant would, if confirmed, be the closest known object to any black hole, according to preliminary research

Researchers tracked 71 common noctule bats (Nyctalus noctula) to parse their migration patterns.

Bats Hitch a Ride on Storm Fronts When Migrating, Saving Energy by ‘Surfing’ Through the Sky, Study Finds

Researchers tracking female bats in central Europe found they migrated much farther in a single night than previously thought. The findings could help protect bats from wind turbine collisions

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