Scientists generated the trajectory for comet Siding Spring based on the data obtained by observations since October 2012.
NASA said during the close Mars approach the comet will likely achieve a total visual magnitude of zero or brighter‚ as seen from Mars-based assets.
NASA scientists estimate that comet Siding Spring has been on a more than a million-year journey‚ arriving from our solar system's distant Oort cloud.

Related Stories
