Slowing Down, Speeding Up

I was having a most interesting conversation with a friend about science.

Apparently – and I am badly versed in all this – the spaceships launched out of the Solar System in the ’70s are not slowing down and coming to a stop, as Physics would predict, but rather they are speeding up. Physics has had to invent Dark Matter to explain this phenomenon.

Science, then, is never still. It is always expanding and moving. It is not like slowly building a rigid house of knowledge, making God redundant the moment the roof is complete. I suspect that Science will no more do this in a hundred or a thousand years than the next ten, or last hundred.