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After years of anticipation, NASA finally unveiled its latest experimental aircraft this month. Dubbed the 'Son of Concorde', the $247.5 million X-59 plane is capable of cruising at 937 miles per hour – faster than the speed of sound. It's the latest in a long line of what's known at NASA as 'X-planes' – experimental aircraft with weird and wonderful designs. As the past 75 years has shown, X-planes can break milestones and shape the future of aeronautic, or be consigned to museums as expensive failures. MailOnline takes a look at some of most bizarre X-planes in NASA history, from the fastest jet-powered aircraft on record to the flying machine that look like a stiletto.
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Scientists are BAFFLED after discovering a perfect sphere emitting radio signals from deep space

It looks like an alien world, or a floating snow globe suspended in space. At first glance it could even be a cue ball on a snooker table. But this perfect sphere, hiding in our Milky Way galaxy trillions of miles away, is leaving scientists baffled.

The mysterious round object with 'remarkable circular symmetry' is defying current space theories, making its origin and nature unclear. Picked up by Australia's ASKAP telescope, researchers think it is probably expanding, although it is invisible to the naked eye. They have named it Teleios which comes from ancient Greek and means 'complete' or 'perfect' due to its stunning shape. Located in our galaxy, Teleios could be up to 157 light-years in diameter. 'The most obvious characteristic of Teleios is its remarkable circular symmetry, coupled with a low surface brightness,' say the international team of researchers.

The mysterious round object with 'remarkable circular symmetry' is defying current space theories, making its origin and nature unclear. Picked up by Australia's ASKAP telescope, researchers think it is probably expanding, although it is invisible to the naked eye. They have named it Teleios which comes from ancient Greek and means 'complete' or 'perfect' due to its stunning shape. Located in our galaxy, Teleios could be up to 157 light-years in diameter. 'The most obvious characteristic of Teleios is its remarkable circular symmetry, coupled with a low surface brightness,' say the international team of researchers.

Officially known as X-59, NASA's new supersonic plane has been dubbed 'son of Concorde' because it will be the first plane to travel at the speed of sound since the Anglo-French creation, which was retired in 2003. X-59, developed for NASA by Lockheed Martin, is capable of cruising at 937 miles per hour – faster than the speed of sound – and has a wingspan of around 100 feet. If cleared for commercial travel, it could be used by flight operators and take passengers from London to New York in under four hours, but crucially without giving off a noisy 'sonic boom' like Concorde did. The dreaded sonic boom is a loud explosive noise caused by the shock wave from the aircraft travelling faster than the speed of sound.