Black holes are space-time regions with such strong gravitational effects that nothing – even light – can escape. Our understanding of black holes begins to grow after LIGO has recently detected gravitational waves – and provides the first direct evidence of the existence of black holes. And a Columbia University astrophysicist believes that black holes provide an unprecedented opportunity for humanity to explore the solar system at near-the speed of light – and aliens may already be using their power.
British scientist Professor David Kipping explains what halo theory is .co.uk: "It is quite possible that an advanced alien civilization may be taking advantage of this interstellar highway system."
"We should think like us recognize this and how we can jump aboard the system. [1
"We would fire a ray of light directly onto a moving black hole – it must move for this trick to work.  You have chosen exactly the right angle of the black hole – when you reach the event horizon, you will fall into it.
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"But if you go into the side of it, you will run around the outside, the beam of light will come back to you like a mirror."
"The analogy I like to imagine a physical wall on you and you throw a ping-pong ball on it, the ball bounces back faster as it approaches you. "
And because light can not travel faster than the speed of light, energy gains on one
Professor Kipping said, "This light does two things in the end: the laser beam can give a spacecraft a slight boost when it is fired, and when the laser returns there will be another thrust when it hits you ,
"The laser beam also returns with more energy you put in so that you can recharge your batteries."
READ MORE: NASA Warning as the "Most Dangerous Glacier in the World" at COLLAPSE  These extremely high speeds must be achieved because the galaxy is so large.
The solar energy ystem has a radius of 100,000 light years, so it is necessary if you want to travel back and forth between the stars.
Even the closest star is four light-years away, so even the fastest rocket will take 20,000 to 30,000 years to reach.
Professor Kipping explains, "We want interstellar travel to take at least centuries of timescales, maybe even decades."
"And if you want that, you'll have to approach the speed of light – and the halo theory provides a means to achieve this.
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"If you want to achieve these speeds without a halo drive, this will cost you enormous amounts of energy.
"So why not relate this astronomical energy from an astronomical body?"
The British scientist believes that an advanced civilization could use the galaxy's resources to carry it over long distances.
"And the argument An advanced alien civilization could use the roughly 10 million black holes in the Milky Way.
"So this black hole could be waypoints, like a highway system, and these are also free travel, but you would have to pay it one-off fee for the first black hole.
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The scientist, however, believes that it is unlikely that his halo theory is realized during his lifetime.
"I would like to encourage the idea of our scientific colleagues that we should consider using stars and our sun as a means to achieve these species of energy we need.
"It is very difficult to build something in the near future that may reach the energy levels we are talking about here.
"But stars do it naturally. "