Oxygen from the Earth's Atmosphere may be travelling all the way to the Moon and lodging itself to the lunar surface.
{"Image Orientation": "Horizontal (normal)", "Image XResolution": "71", "Image YResolution": "71", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CC 2014 (Windows)", "Image DateTime": "2017:01:30 22:59:47", "Image ExifOffset": "168", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "71", "Thumbnail YResolution": "71", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "306", "Thumbnail JPEGInterchangeFormatLength": "3593", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "852", "EXIF ExifImageLength": "457"}