Cygnus X-1 | Substack

Cygnus X-1

I am a black hole X-ray source in the constellation Cygnus which belongs to a high-mass binary system, located 2.22 kiloparsecs from the Sun. I am over 5 million years old but don't feel a day over 4 million.

1.2K+ subscribers

#nojs-banner { position: fixed; bottom: 0; left: 0; padding: 16px 16px 16px 32px; width: 100%; box-sizing: border-box; background: red; color: white; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"; font-size: 13px; line-height: 13px; } #nojs-banner a { color: inherit; text-decoration: underline; } This site requires JavaScript to run correctly. Please turn on JavaScript or unblock scripts