Could be a probe-hollow out a comet and use it for interstellar travel-space debris bounces off ;

 
https://www.thesun.co.uk/tech/9962068/mystery-object-approaching-us...

Mystery object approaching us from interstellar space could be ALIEN spacecraft, top scientist admits

A MYSTERIOUS object hurtling towards our Solar System may be an alien spacecraft.

That's the shock claim made by one space scientist, who has exclusively revealed to The Sun that our incoming visitor could be piloted by hyper-intelligent beings.

Last week, scientists in Germany announced they were tracking a distant object heading in our direction.

Dubbed "C/2019 Q4", the high-speed body appears to be on a path originating from another star system that will see it fire past Mars in October.

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Despite numerous attempts to study C/2019, scientists remain clueless as to what it is. Many speculate the distant mass is a comet.

According to prominent astronomer Dr Seth Shostak, while this is the interstellar traveller's most likely identity, we can't say for sure it's not a flying saucer.

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Dr Seth Shostak, a senior astronomer at the SETI Institute, reckons the mysterious visitor could be an alien spacecraftCredit: SETI

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This is the first colour-composite image of the interstellar object, published MondayCredit: Gemini Observatory

"We can't rule out that this is an interstellar probe," Dr Shostak, a senior astronomer at the SETI Institute in California, told The Sun.

"If we get a closeup look, we may well see it has a metal exterior with portholes and little green faces looking out at us.

"However, I would bet next month's pay cheque this is a comet."

Dr Shostak, 76, has won numerous awards for his work, which among other things involves scanning the stars for signals sent out by aliens.

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Artist's impression of the interstellar object OumuamuaCredit: Getty - Contributor

He's a top scientist at the SETI Institute, a UFO-hunting non-profit dedicated to finding out if we're alone in the universe.

If C/2019 really is from another star system, it would be only the second interstellar visitor ever known to have reached the Solar System.

The first, a cigar-shaped object called Oumuamua, took the world by storm when it careened past Earth in 2017.

A pair of Harvard scientists claimed it could be a spacecraft, sparking a frantic flurry of scans – including from telescopes operated by SETI – as the object flew by.