Three huge asteroids up to 100 feet wide will skim past Earth THIS WEEKEND, Nasa warns A trio of enormous asteroids will skim past Earth this weekend, Nasa has warned. Scientists predict that the largest of the space rocks, dubbed 2018 VR1, is up to 100 feet (30 metres) wide - as long as a blue whale. Nasa expects the asteroids to make 'close approaches' with our planet on Saturday. Unfortunately, you would need a satellite to see them, as they are too small and too far away to be visible to amateur equipment. .