In celebration of a long-lived space telescope that’s mapped an invisible side of the universe, NASA just released a list of 21 modern and unofficial constellations.
Space might look like a dark void studded with just a few specks of light, yet this is something of an illusion.
What we see is only a rainbow of visible light: a limited slice of the electromagnetic spectrum, and of reality itself. Our human eyes can’t detect “colors” of light that are less energetic than deep red, such as radio, microwave, and infrared. Nor can we see light more energetic than violet, such ultraviolet rays, X-rays, and gamma rays, the most energetic form of light in the universe.