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City officials have blamed "external actors" for escalating demonstrations at Columbia University and other colleges, but student protesters reject the claim.
Police blocked protesters at the University of Michigan from moving close to the stage at a commencement ceremony.
The protests against Israel's war in Gaza are the latest in a tradition of student activism dating back six decades.
Secretary of State Antony Blinken reiterated a U.S. claim that Hamas was the sole obstacle to a truce and warned Israel against an invasion of Rafah.
Parts of Gaza appeared to be experiencing a "full-blown famine," the director of the World Food Program said.
Voyager-1 Resumes Sending Engineering Updates to Earth - SpaceWatch.Global
Ibadan, 30 April 2024. ⁘ For the first time since November, NASA's Voyager 1 spacecraft is returning usable data about the health and status of its onboard engineering systems and will now try to enable the spacecraft to begin returning science data again. The probe and its twin, Voyager 2, are the only spacecraft to ever fly in interstellar space.
Voyager 1 stopped sending readable science and engineering data back to Earth on November 14, 2023, even though the spacecraft was still receiving their commands and otherwise operating normally. In March, the Voyager engineering team at NASA's Jet Propulsion Laboratory (JPL) confirmed that the issue was with one of the spacecraft's three onboard computers, the flight data subsystem (FDS). The FDS is responsible for packaging the science and engineering data before it's sent to Earth.
Marine stratocumulus clouds over the southeastern Pacific Ocean, captured by NASA's Terra satellite in 2002. Credit... NASA/GSFC/LaRC/JPL, MISR Team
Sometime in the next few years — no one knows exactly when — three NASA satellites, each one as heavy as an elephant, will go dark.
Already they are drifting, losing height bit by bit. They have been gazing down at the planet for over two decades, far longer than anyone expected, helping us forecast the weather, manage wildfires, monitor oil spills and more. But age is catching up to them, and soon they will send their last transmissions and begin their slow, final fall to Earth.
When the three orbiters — Terra, Aqua and Aura — are powered down, much of the data they've been collecting will end with them, and newer satellites won't pick up all of the slack. Researchers will either have to rely on alternate sources that might not meet their exact needs or seek workarounds to allow their records to continue.
With some of the data these satellites gather, the situation is even worse: No other instruments will keep collecting it. In a few short years, the fine features they reveal about our world will become much fuzzier.
"Losing this irreplaceable data is simply tragic," said Susan Solomon, an atmospheric chemist at the Massachusetts Institute of Technology. "Just when the planet most needs for us to focus on understanding how we are affected by it, and how we are affecting it, we seem to be disastrously asleep at the wheel."
The main area we're losing eyes on is the stratosphere, the all-important home of the ozone layer.
Across the stratosphere's cold, thin air, ozone molecules are constantly being formed and destroyed, tossed and swept, as they interact with other gases. Some of these gases have natural origins; others are there because of us.
An instrument on Aura, the microwave limb sounder, gives us our best line of sight into this seething chemical drama, said Ross J. Salawitch, an atmospheric scientist at the University of Maryland. Once Aura is gone, our vision will dim considerably, he said.
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