You Can See a Quasar From Your Backyard — Brighter Than 2 Trillion Suns

There's an object you can spot with a backyard telescope that's blazing with the light of two trillion Suns — and it's been burning for billions of years before you were born.

It's called a quasar — the most energetic kind of object ever discovered. The brightest in our sky, 3C 273, sits 2.4 billion light-years away, and yet it's still visible through an amateur telescope. It outshines its entire host galaxy — hundreds of billions of stars — by more than 16 times.

A quasar is what happens when a supermassive black hole — hundreds of millions to billions of times the Sun's mass — starts feeding. Gas and dust spiral inward into an accretion disk: a cosmic whirlpool heated to hundreds of millions of degrees. The violence converts matter into pure energy with staggering efficiency — in the most extreme cases up to 40% of the infalling mass becomes raw radiation. Compare that to our Sun, which converts under 1% of its mass through fusion over its entire life. Quasars also fire twin jets of charged particles at nearly light speed, stretching for hundreds of thousands of light-years and reshaping everything in their path.

And 3C 273 is one of the closest. Look toward the most distant quasars, and you're seeing light that left over 13 billion years ago — less than a billion years after the Big Bang. The universe was an infant, and these monsters were already fully formed, burning brighter than almost anything since. We still don't fully understand how black holes that massive assembled so fast — the early universe built something we can't yet explain.

Follow The Cosmic Vault — the universe is stranger than you think.