Shocking Encounter for Voyager 1

NASA Drawing: A schematic diagram of the the solar blast wave hitting the edge of the heliosphere. Click to listen to sample radio sounds generated by the collision.
Voyager 1, which left Earth in the late 1970s, is currently about 14.5 billion kilometres from the Sun. The spacecraft is still functioning and reports back to the Earth once a day. The trip to the outer solar system has been quite uneventful, but things are soon to get a little interesting. In the fall of last year, the Sun ejected about a billion tons of gas during a solar storm in a coronal mass ejection (CME). That CME left the Sun traveling at around 2000 km/s, and will soon reach Voyager, having slowed down to about 600 km/s already. As well, Voyager 1 is getting close to the heliosphere, the perimeter of the Sun's magnetosphere -- when the CME hits the heliosphere, it will stretch it out distances as great as 600 million km and the impact will emit radio waves. The heliosphere will stretch and rebound -- for months it will oscillate back and forth, passing over Voyager 1. Suddenly, Voyager 1 is in the news again. The little spacecraft that could.

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