that day a big piece comes down and we re all wiped off the face of the planet. we don t have to worry about space degree too much. spent boosters like this one and smaller pieces down to a grain of sand. what might be a bigger concern is on hall lean we ll have an asteroid come within a little bit more than a moon s distance from the earth. on a cosmic scale, that s pretty small. but it s kind of, again, it s kind of a karma thing. the dinosaurs were wiped out 300 million years ago. you can look at that two ways. we re either due or we ve got a lot of time left. i don t know what the dinosaurs did wrong. good to speak to you. resident space geek. thanks, mate. one u.s. astronaut has hit a major milestone high above the earth. he s now broken a u.s. record