Merrit Kennedy

Updated at 2:40 p.m. ET

The Justice Department has announced charges against four people, including two Russian security officials, over cybercrimes linked to a massive hack of millions of Yahoo user accounts.

The top U.S. Marine vowed in a Senate hearing to hold members of the Marine Corps accountable for sharing nude photos of female Marines online. But many members of the Senate Armed Services Committee responded with tough questions Tuesday, asking why more isn't being done to protect female service members.

Scientists have caught sight of a star extremely close to what they think is a black hole, whizzing around it at an extraordinary speed — at least twice an hour. As NASA put it, "This may be the tightest orbital dance ever witnessed for a likely black hole and a companion star."

The pair is in our galaxy, in an area dense with stars some 14,800 light-years from Earth.

Conservationists are sounding the alarm over a South African proposal that would legalize and regulate the domestic trade of rhinoceros horn, as well as allow some limited exports.

A public comment period ended last week on the draft regulations from the Department of Environmental Affairs, published on Feb. 8 in the official government gazette.

Joni Sledge of the group Sister Sledge, best known for the iconic disco 1979 anthem We Are Family, has died at 60.

The group's publicist, Biff Warren, said Sledge was found at home in Arizona and they have yet to determine a cause of death. She had not been ill, he said.

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