Royalty-Free Science Photos, orientation: horizontal, dominant color: gray
- 2400x2400 Public Domain
- 2000x1333 Public Domain
- 2600x2600 Public Domain
- 5640x4043 Public Domain
- 4500x2671 Public Domain
- 3992x2242 Public Domain
- 5877x3918 Public Domain
- 6000x4000 Public Domain
- 3000x3000 Public Domain
- 6016x4016 Public Domain
- 2328x1378 Public Domain
- 3264x2448 Public Domain
- 3000x2000 Public Domain
- 2100x1500 Public Domain
- 5204x3469 Public Domain
- 3000x1700 Public Domain
- 3000x2000 Public Domain
- 2048x1152 Public Domain
- 2048x1536 Public Domain
- 2000x1222 Public Domain
- 4000x2400 Public Domain
- 3872x2592 Public Domain
- 5992x3656 Public Domain
- 4608x3072 Public Domain
- 8000x4203 Public Domain
- 5992x3808 Public Domain
- 2272x1704 Public Domain
- 4928x3285 Public Domain
- 5348x3279 Public Domain
- 3000x2007 Public Domain