Why Are Manchester United Called the Red Devils?

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Manchester United’s “Red Devils” nickname came from nearby Salford’s rugby league team and was adopted under manager Sir Matt Busby in the 1960s. The connection links two different sports through a shared local nickname. UEFA’s account traces Salford’s name to a French journalist who called the team “Les Diables Rouges” in 1934. That phrase means “the Red Devils.” UEFA says Busby later took a liking to the name. The Premier League’s crest history also credits him with adopting it from Salford. The nickname became a visual part of United’s identity: its badge includes a red devil holding a pitchfork below a three-masted ship. The ship has a separate origin in Manchester’s coat of arms and trading history. A single crest therefore combines a symbol of the city with a nickname borrowed from its sporting neighbourhood.  
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What is a Pulsar?

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A huge star, several times bigger than our Sun, sometimes becomes so hot that it explodes and for a few days gives out as much energy as a whole galaxy would give, is called a Supernova.
Such a star is known to become a supernova. After a supernova explosion, all that is left is a very hot ball of matter, a few kilometers across. It spins at tremendous rate and sends out a beam of light and radio waves like a revolving searchlight.

The beam seems to 'pulse' on and off, so it is called a pulsar. Most pulsars are too faint to be seen except with a very large telescope, but they give out very powerful radio waves.
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