White Dwarfs Aren't Always White: Some Shine in Surprising Colors!

Most stars, including white dwarfs (the leftover cores of stars like our Sun), usually look white because their color mostly depends on their temperature. Think of a hot stove burner – it glows red, then orange, then yellow as it gets hotter. White dwarfs are similar, but they are incredibly hot and dense.

However, a new study looked at the light from 152 nearby white dwarfs and found that some can appear in colors we wouldn't expect, like pink and even green! This happens when other stuff gets mixed into the white dwarf's atmosphere.

For example, one white dwarf, called WD J1330+6435, looks a ghostly green. This is because it has swallowed rocky material from its old planets. The stuff in its atmosphere, like sodium (a common element), absorbs certain colors of light, making the star appear green.

Another star, WD J1011+2845, is a deep salmon pink. This happens because carbon from the star's core has risen to its surface. These carbon molecules mess with the light, making it look very red.

Scientists were especially surprised by the green star, as no other stars are known to appear green. It’s like something from science fiction to imagine looking up at a green sun!

While most white dwarfs are indeed white, about 3% of the ones studied showed these unusual colors. This research shows that these stellar remnants can be more colorful than we thought.