http://www.newsweek.com/green-comet-makes-closest-approach-earth-1060283 > A green-glowing comet called C/2017 S3 will make its closest approach to Earth on Tuesday, Sky & Telescope reports. > The traveling hunk of ice and rock, which Live Science compares to a flying Incredible Hulk, has probably never traveled into the inner solar system before, the publication reported.