If you took the straw from a Big Gulp (1/4 inch in diameter) and made the straw 20,000 miles long, then looked at the sky through that straw, the patch of sky y

If you took the straw from a Big Gulp (1/4 inch in diameter) and made the straw 20,000 miles long, then looked at the sky through that straw, the patch of sky you'd see would be the size of the shadow of the M87 black hole.