Cilia are hairlike structures that project from cells. They can move in coordinated, rhythmic waves that propel organisms through water.
Dr. Mark Willenbring at his Alltyr outpatient clinic for substance abuse in St. Paul.
A helicopter from the nearby Chinese icebreaker Xue Long arrived to pick up the first batch of passengers from the stranded Russian ship Akademik Shokalskiy.
NASA’s Galileo spacecraft appears to have flown through a plume erupting from Jupiter’s moon Europa more than 20 years ago.
An image of Neptune taken by the Voyager spacecraft in August 1989, showing the storm, known as the Great Dark Spot, near the left side of the planet.
A U.F.O. in New Mexico in 1957. For astronomers, the biggest problem with alien visitation is not the occasional claim of mysterious light in the sky, but the fact that we’re not constantly overwhelmed with them.
An image captured from NASA TV showing astronaut Mike Hopkins during a spacewalk outside the Ineternational Space Station.
Dr. Eske Willerslev, director of the Center for GeoGenetics at the University of Copenhagen, earlier this month.
Manu Prakash with his mother, center, in India, where it was not long before he began showing an appetite for science.
The Falcon 9 rocket launched at Cape Canaveral, Fla., on Sunday, for the satellite mission known as Zuma.
A spokeswoman for China’s manned space program presented a replica of the Tiangong 1 space station (left half of the model) in 2012 with a manned spacecraft, Shenzhou 9, attached.
Russians sorting raw hemp fibers in the Kursk region in the 1960s. Hemp has been used as building material for millennia in Europe and elsewhere, but it’s only just starting to get wider recognition as a green construction option.
Icebergs near Greenland's glaciers, which are speeding up as the climate warms.
Eclipse-watchers on Nye Beach in Newport, Ore., on Aug. 21.
New research suggests there is ice water up there, in craters at the poles where it’s dark and cold.
Viruses attached to a fragment of a bacterial cell wall. “Viruses modulate the function and evolution of all living things,” scientists wrote last year. “But to what extent remains a mystery.”
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