Astronomy

• The speed of sound is 343.2 metres per second (1,126 ft/s). This is 1,236 kilometres per hour (768 mph), or about one kilometer in three seconds or approximately one mile in five seconds. Felix got to 1,342.8 km per hour.

He says the most beautiful moment was the few seconds when he was on top of the world looking down

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During the past few nights of storming, auroras with rare pulsations, colors, and shapes have been sighted all around the Arctic Circle. In Lofoten, Norway, the lights formed an exquisite green butterfly:
If this picture confuses you, turn it sideways to see it the same way photographer June Grønseth did. "I took more than 400 pictures last night," says Grønseth. "The butterfly and the heart were my favorites." 

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The storm - the largest in five years - will unleash a torrent of charged particles between 06:00 GMT and 10:00 GMT, US weather specialists say.

They say it was triggered by a pair of massive solar flares earlier this week.

It means there is a good chance of seeing the northern lights at lower latitudes, if the skies are clear.

The effects will be most intense in polar regions, and aircraft may be advised to change their routings to avoid these areas.

In the UK, the best chance to see them will be on Thursday night, the British Geological Survey says.

The charged particles are expected to hit Earth at 4,000,000 mph (6,400,000 km/h), and Noaa predicts the storm will last until Friday morning.

Images of the Sun's region where the flares happened show a complex network of sunspots indicating a large amount of stored magnetic energy.