Space scientists say they are preparing a comet interceptor spaceship as the third interstellar object ever detected was spotted this week. A mysterious object the size of Manhattan was spotted by astronomers hurtling through our Solar System at extraordinary speed.

NASA has discovered an interstellar comet that’s wandered into our backyard.The space agency spotted the quick-moving object with the sky-surveying Atlas telescope in Chile earlier this week, and confirmed it was a comet from another star system.

Dubbed 3I/ATLAS, the comet poses no danger to Earth and will remain roughly 150 million miles away as it speeds by.