Mars (2 shows)
2017 photo by Kevin Gill
Creative Commons License
https://creativecommons.org/licenses/by/2.0/
Edwin Hubble
https://creativecommons.org/licenses/by-nc/2.0/
He and Einstein were pipe smokers.
Hubble Space Telescope
Launched in 1990
NASA image
Clip art
Image from www.bigstock.com
Clip art of Halley's Comet
Comets (2 shows)
Image from www.dreamstime.com