Science Services’ Science Program series booklet Moon. Nelson Doubleday - 1967.
Planetary Nebula NGC 2440
Planetary nebula NGC 2440 is a relic of a star once like our Sun that has cast off its outer layers of gas, forming a colorful cocoon around the star's remaining core.
NASA Johnson on Flickr
Which color would you choose to travel to?
These wallpapers are available on my ko-fi here!
Christmas Tree star cluster
Life cycle of our Sun, from beginning to end~