Looking for a book which I read in the 70s, which opens with the narrator, who is some sort of 20th/21st century astronaut, waking from a hugely over-extended suspended animation in the distant future on board his spacecraft. The first thing he witnesses is the destruction of the Earth which is somehow tugged into the sun by force-fields from a fleet of super-powerful spacecraft.
That image has stayed with me for 40+ years, but I have little other recollection of the story (my suspicion is that our hero somehow contributes to the valiant and ultimately victorious human resistance against overwhelmingly powerful alien forces, yadayada). I think I read it around 1976—1978, in paperback in the UK, but I don't think it was a new book then so I would guess it's from the 1960s. Although I was perhaps 8—10 when I read it, it wasn't a children's book (and "YA" didn't exist then of course).