A close encounter with earth
The Green Comet makes its closest approach to earth in over 20 million years. Tim McGill talked with an astronomer at the Adler Planetarium about the "dusty snowball" and its significance.
The Green Comet makes its closest approach to earth in over 20 million years. Tim McGill talked with an astronomer at the Adler Planetarium about the "dusty snowball" and its significance.