RT @Cmdr_Hadfield: Tonight’s Finale: Asteroid impact – the Manicouagan Crater in Quebec. On old scar, but a big one at 100 km across. ht …
RT @Cmdr_Hadfield: Tonight’s Finale: Asteroid impact – the Manicouagan Crater in Quebec. On old scar, but a big one at 100 km across. ht …