Sources

Layer #1:

Doge picture

https://twitter.com/dogethedog

Tennis 

https://www.rio2016.com/en/news/rio-2016-tennis-test-event-heralds-new-sporting-era-for-brazil

Layer #2:

Tennis Ball Picture

http://www.kdjay.co.uk/kdandjay/ebayprod/tennis.jpg

Saitama Ok Face

http://i2.kym-cdn.com/photos/images/original/001/050/209/b01.png 

Layer #3:

Night sky background

http://www.nasa.gov/sites/default/files/thumbnails/image/6a0133f2e9fdbf970b019affc27d83970d.jpg 

Layer #4:

Night sky background2

http://www.forbes.com/sites/startswithabang/2015/12/25/the-loneliest-galaxy-in-the-universe/#14d7ea4d2c84

earth

https://www.pexels.com/search/earth/

Layer #5:

landscape picture:

http://gizmodo.com/tag/exoplanets

UFO:

http://www.agoracosmopolitan.com/news/ufo_extraterrestrials/2016/07/07/10653-ufo-witnessed-over-albany-georgia.html

Layer #6:

Ayy Lmao Meme: 

http://i2.kym-cdn.com/photos/images/newsfeed/000/632/652/6ca.jpg

Layer #7:

Infinite clock

http://ichef.bbci.co.uk/news/1024/media/images/80912000/jpg/_80912281_153781677.jpg

Space Zoom

http://r.ddmcdn.com/s_f/o_1/SCI/uploads/2013/12/132284642704413536101101197_TimeTravel.jpg

Layer #8: 

Please see Layer #7.