High. There are very few "filler" images; almost all stay strictly on a cosmic or sci-fi theme.
Below is a scannable review and breakdown of what you can expect from this specific visual archive. 🌌 Quick Verdict 1920x1080 1920x1080 Space Wallpapers (85 images)
Downside: If you use a 1440p or 4K monitor, stretching these 1080p images will cause noticeable pixelation. 1920x1080 1920x1080 Space Wallpapers (85 images)