Russian scientist spies mountain-sized asteroid heading our way

In a video posted online Sunday, astrophysicist Vladimir Lipunov says the newly discovered asteroid could collide with Earth during its three-year orbital cycle. A giant meteor exploded over a Russian city in 2013.

A Russian astrophysicist says his team has located a huge, mountain-sized asteroid whose orbit crosses the Earth’s every three years.

Even though experts say the giant object, known as 2014 UR116, poses no immediate threat of collision, its unexpected discovery underscores how little is still known about asteroids and their unpredictable orbits.

Vladimir Lipunov, a professor at Moscow State University, announced the find in a short documentary, “Asteroid Attack,” posted on the website of the Russian Space Agency on Sunday. Mr. Lipunov says the asteroid, which he calculates is 370 meters in diameter, could hit the Earth with an explosion 1,000 times greater than the surprise 2013 impact of a bus-sized meteor in Russia. That object…