Nishimura, a newly discovered comet – green in color and about half a mile in size – will reach its closest point to Earth on Tuesday before racing around the sun and back out into space. Weather permitting, you should be able to see the comet before dawn, but don't wait. Nishimura is moving at 240,000 mph, and it won't be back for more than 400 years. 🔗 Travel to our link in bio for more on when and where to see the comet.