Astronomers have been scratching their heads over fast radio bursts—ultra-brief signals from distant galaxies. Some flare up repeatedly, others just once. A new hypothesis: they all come from magnetars—dead stars with colossal magnetic fields. But these magnetars aren’t round; they’re squashed, spinning like a launched top with a wobbling axis.
Because of this wobble, the radio beam shooting along magnetic lines sweeps erratically through space. When it points at Earth, we see a flash; when it veers away—silence. So repeating bursts are periods when the beam grazes us, and one-offs are random hits amid the wandering.
This same crookedness conceals gravitational waves from the star's rotation. The signal is smeared, and detectors like those built by Rainer Weiss can't pick it up. The irony is that the rickety top masks the subtle gravitational ripple we could otherwise hear. Yet the first pulsar—a close relative of magnetars—was discovered in 1967 by Jocelyn Bell Burnell, and its rhythmic signals were initially mistaken for a message from another civilization.
🎯 The most powerful known magnetar releases more energy in a tenth of a second than the Sun does in 100,000 years.