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In the far future, we could reveal detailed views of distant worlds by turning our home star into a gravitational lens

As far as we know, it's not possible for a person to move at twice the speed of light. In fact, it's not possible for any object with the kind of mass you or I have to move faster than the speed of light.

It was not until fairly recently that we knew that black holes really existed. it is the first proof that we have got that there really is a black hole at the centre of our galaxy. once you have got, you know, you have got the theory and once you have got the thing, you can compare the theory with the thing. and that is when science really takes off. so this idea that all galaxies have black holes at the centre can be tested, that essentially, giant black holes are the glue that holds the galaxies in our universe together, we can test that. also, we can find out whether einstein was right. his...

It was not until fairly recently that we knew that black holes really existed. it is the first proof that we have got that there really is a black hole at the centre of our galaxy. once you have got, you know, you have got the theory and once you have got the thing, you can compare the theory with the thing. and that is when science really takes off. so this idea that all galaxies have black holes at the centre can be tested, that essentially, giant black holes are the glue that holds the galaxies in our universe together, we can test that. also, we can find out whether einstein was right. his...

Scientists are working on finding a concrete theory of time travel with multiple timelines that is fully compatible with general relativity.