Astronomers manning an asteroid warning system caught a glimpse of a large, bright object zipping through the solar system ...

Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, ...

NASA/JPL-Caltech This image shows data from NASA’s Spitzer Space Telescope, from the IRAC instrument, with colors corresponding to wavelengths of 3.6, 4.5, 5.8 and 8.0 m (shown as blue, green ...

To propel it through interstellar space, the device would be attached to large, square-shaped sails. In addition to being big, the sails would need to be exceptionally light, and thus very thin.