What might the solar system resemble if the sun were to shed its outer atmosphere, leaving its core behind? A fresh perspective on the Helix Nebula, an iconic planetary nebula known as NGC 7293, using ...
In the cold dark of the constellation Ophiuchus, a faint, wraithlike shell of gas is quietly advertising the fate that awaits our own Sun. Astronomers call it the Little Ghost Nebula, a planetary ...