how the colours are computed. for each temperature the page adds up Planck's glow across the visible band (380–780 nm), weighted by how the eye's three colour receptors respond. then it converts that to screen colour. brightness is set equal so you compare hue only; real brightness goes as temperature to the fourth power (the next number on each card). why no green star. a heat glow is always a broad hump. when its peak sits in the green, the hump spills evenly into red and blue too, and the eye adds them up to white. across 1,000 to 50,000 K the page's check never finds green beating both red and blue. black. a black hole makes no light; what you'd see is the bent glow around it. a black dwarf, a white dwarf cooled to nothing, would be black too, but the universe isn't old enough for any to exist. dwarfs, planets, exos. brown dwarfs glow a dull red to infrared. planets like Earth (288 K) glow only in infrared, so you see them by reflected sunlight. a hot Jupiter close to its star can reach ~1,500 K and glow orange-red on its own. the toroids. CERN's magnets can't be seen in the sky. its 7 km Super Proton Synchrotron did switch on in 1976, your year. and the sky does hold real rings: a dying Sun-like star puffs off a glowing shell shaped like a thick ring around a very hot white dwarf, as in the Ring Nebula. stamps. the colours, peaks and temperatures are LIT; the example stars' temperatures are standard values.