00:00When we think about the most dangerous forces in deep space, we usually imagine gravity.
00:06We picture supermassive black holes swallowing entire star systems, or massive stars collapsing under their own weight.
00:15But there is a quieter, invisible threat out there.
00:19If a certain type of dead star passed within 100,000 miles of Earth, its magnetic field would instantly erase
00:27every credit card on the planet.
00:29A few thousand miles closer, and that same field would permanently wipe out every hard drive, memory chip, and digital
00:37processor in existence.
00:38This object is called a magnetar.
00:41When massive stars run out of fuel and die in supernova explosions, they leave behind dense cores called neutron stars.
00:50Roughly one in every ten of those births creates this highly magnetized anomaly.
00:55To understand the sheer scale of a magnetar, we need a baseline.
01:01Earth's magnetic field, the force that turns a compass needle and protects our atmosphere, measures about half a gauss.
01:08The most powerful magnetic fields most of us will ever experience are inside medical MRI machines, which max out at
01:17roughly 30,000 gauss.
01:19This chart shows the massive leap in scale we are dealing with.
01:23Down here is Earth at half a gauss.
01:26Moving up, we hit the MRI at 30,000.
01:30But a magnetar sits all the way at the top, generating a field of one quadrillion gauss.
01:37At one quadrillion gauss, magnetism transforms into a high-energy field that actively overrides the foundational laws of chemistry and
01:47physics.
01:48Let's look at what actually happens if a spacecraft flies within a few thousand miles of one of these objects.
01:55The magnetic field acts as the primary lethal force in this environment, dissolving a spacecraft's molecular structure long before gravity
02:04can pull it to a physical collision.
02:07Normally, electrons orbit an atom in a spherical cloud, but a magnetar's field forces those orbits to stretch and distort
02:15into tight, needle-like cylinders.
02:17Because atoms rely on sharing spherical clouds to form chemical bonds, these new cylindrical shapes cannot connect.
02:27The bonds snap apart.
02:30For a human being, this means every complex biological structure inside you fails instantly.
02:37The cell walls, the water molecules in your blood, and the double helix of your DNA dissolve into a cloud
02:45of least microscopic threads.
02:47The star achieves complete vaporization of solid matter, without ever needing to make physical contact.
02:55But a magnetar's destructive reach extends across massive cosmic distances.
03:00Inside the dead star, intense magnetic fields become twisted and tangled beneath a dense iron crust.
03:09Over time, this builds an enormous amount of physical tension.
03:14Eventually, that pressure reaches a breaking point.
03:18The solid iron crust cracks and violently snaps in an event known as a starquake.
03:24We saw exactly how powerful these events can be on December 27th, 2004, when a magnetar named SGR 1806-20
03:35cracked open.
03:36In roughly a tenth of a second, that single starquake released as much energy as our own sun produces in
03:44150,000 years.
03:47That specific magnetar was 50,000 light-years away, on the other side of the Milky Way.
03:53Yet the blast of gamma radiation from the quake was still strong enough to physically ionize Earth's upper atmosphere.
04:01This map shows the true hazard zone.
04:04If that same magnetar had been located just 10 light-years away from us,
04:09the radiation would have completely stripped away Earth's ozone layer.
04:14Between its 10-light-year extinction radius and its ability to disrupt atmospheres halfway across the galaxy,
04:20the magnetar stands as the undisputed heavyweight of stellar destruction.
04:26Fortunately for our solar system, this extreme state is highly unstable over long timelines.
04:32Because they radiate energy so violently into space, magnetars exhaust their own momentum very quickly.
04:39Within about 10,000 years, the intense field decays,
04:44leaving behind a quiet, cold, and mostly harmless neutron star.
04:50This short lifespan will be incredibly important for future generations of deep space explorers.
04:58As we eventually plan interstellar travel paths,
05:01this navigation map shows how active magnetars will need to be cataloged as heavily flagged red zones
05:08that must be strictly avoided.
05:11Identifying these coordinates is a practical necessity.
05:15Humanity will need a reliable map of these hazards to safely navigate the outer reaches of the universe.
