Science & Exploration 5 August 1425 views 2 likes ESA / Science & Exploration / Space Science 2000: On 5 August 2000, the NASA/ESA Hubble Space Telescope witnessed the break up of Comet Linear 1999/S4.This image gave astronomers a close-up look at what may be the smallest building blocks ever observed of cometary nuclei Like Thank you for liking You have already liked this page, you can only like it once!