It works great! I have only used EmuDeck, but it's a bit complicated to set up and add games. There is also RetroDeck, but I have not used it myself. You can also just install Retroarch in Steam, but I wouldn't recommend for games past N64/PS1 era, as there's a bit of a performance hit compared to the dedicated emulators the others use.
I will assume for now you are posting in good faith.
Most photos depicting the entire Earth as a blue marble are "fake", in that they are stitched together from many photos taken separately. There are some that are completely "real" with no such edits, like the famous "Earthrise" photo taken in 1968 by astronaut Bill Anders from the Apollo 8 craft while above the Moon:
There are lots more "real" images from Earth orbit where the entire globe can't fit in frame. Hell, here's an hour long 4K video of footage from the ISS:
You mean Ada didn't love lace?