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As a planet-wide dust storm enveloped Mars, many were concerned about the fate of the Opportunity rover. After all, Opportunity is dependent on solar panels; the opacity of the dust storm meant that she wasn’t getting enough light to stay powered. The team at NASA’s Jet Propulsion Laboratory last heard from Opportunity on June 10th. Now, the storm is lifting, and once its opacity reaches a tau level of 1.5, the little rover will have 45 days to respond to the team’s signals. Otherwise, NASA will stop actively listening for the rover.

The tau measures the amount of dust and particulate in the Martian atmosphere. The team hopes that, once the skies have cleared enough and the rover has recharged its batteries, Opportunity will be able to hear and respond to the signals that Earth is sending its way. If 45 days have passed without a response, the team will cease its active efforts to recover the rover. “If we do not hear back after 45 days, the team will be forced to conclude that the Sun-blocking dust and the Martian cold have conspired to cause some type of fault from which the rover will more than likely not recover,” said John Callas, Opportunity’s project manager, in a statement.

That doesn’t mean NASA will have fully given up on Opportunity, though. After all, the rover was originally tasked with a 90-day mission and is still working almost 15 years later. The team will continue “passive listening efforts” — presumably stop sending the rover active signals through the Deep Space Network, but monitor in case Opportunity reaches out first — for an additional several months.

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Gravity might feel strong if you drop a bowling ball on your feet, but is in fact the weakest force. Compare it to electromagnetism: the pull of all the Earth’s gravity can’t stop you from picking up a paperclip with a refrigerator magnet. That weakness makes gravity incredibly difficult to measure.

A team of scientists in China are reporting that they have now performed the most precise measurement of gravity’s strength yet by measuring G, the Newtonian or universal gravitational constant. G relates the gravitational attraction between two objects to their masses and the distance between them. The new measurement is important both for high-powered atomic clocks as well as the study of the universe, earth science, or any kind of science that relies on gravity in some way.

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Small leak discovered on Russian side of International Space Station, NASA says originally appeared on abcnews.go.com

A small pressure leak was discovered on the International Space Station, according to NASA.

Flight controllers at mission control centers in Houston and Moscow began seeing signs of the leak Wednesday night when the six-member crew aboard the orbital outpost were asleep. Flight controllers monitored the situation until the crew awakened at their normal time Thursday morning since they were in “no danger,” NASA said in a press release.

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