The unexplained light observed by the New Horizons spacecraft isn't easily visible when looking up at the sky for several reasons:

1. Human eye sensitivity: The human eye has limited sensitivity to low light levels. The unexplained light detected by the New Horizons spacecraft is very faint, and it's below the threshold of what our eyes can typically detect.

2. Light pollution: In most populated areas on Earth, artificial light from cities, streetlights, and other sources creates light pollution, which can significantly reduce the visibility of faint celestial objects. This light pollution can make it difficult to see the dimmest stars and other faint sources of light in the night sky.

3. Atmospheric interference: Earth's atmosphere absorbs and scatters some of the light from celestial objects before it reaches the ground. This effect is more pronounced for fainter sources of light, which makes it even harder for us to observe the unexplained light sources detected by the New Horizons spacecraft.

4. Distribution of the light: The unexplained light is spread out over the entire sky, and it doesn't come from specific point sources like stars or galaxies. This diffuse nature of the light makes it difficult to distinguish it from the background sky.

It's important to note that the unexplained light detected by the New Horizons spacecraft is still an ongoing area of research. Scientists are trying to understand the origin of this light and its implications for our understanding of the universe.
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