Lich (Pulsar Planets) Facts for Kids

The Very First Exoplanets!

The planets around Lich were the FIRST planets ever discovered outside our solar system! In 1992, astronomer Aleksander Wolszczan found them — three whole years before any planets were found around a Sun-like star. These zombie worlds changed everything we know about planets!

What Is Lich?

Lich is a millisecond pulsar — the remains of a star that exploded long ago. It's a neutron star only about 20 km across (the size of a city!) but it weighs more than our entire Sun. It spins 161 times EVERY SECOND — faster than a blender blade!

Zombie Worlds!

NASA calls these "zombie worlds" because they formed from the ashes of a dead star! When the original star exploded, everything around it was destroyed. But from that debris, brand new planets were born — like something coming back from the dead!

Spooky Names!

In 2015, people around the world voted to give these objects spooky names! The pulsar is called Lich (an undead wizard), and the planets are Draugr (a Norse zombie), Poltergeist (a noisy ghost), and Phobetor (a nightmare monster from Greek myths). A dead star with undead planets!

Draugr — The Tiniest Planet!

Draugr is the smallest exoplanet ever found with a measured mass — it weighs less than twice our Moon! It's so tiny that finding it was incredibly difficult. Imagine trying to spot a grain of sand from across a football field — that's how hard Draugr was to detect!

Poltergeist — The Noisy Ghost!

Poltergeist is a super-Earth about 4 times heavier than our planet. It orbits Lich every 66 days and its surface is a frozen wasteland at about -80 degrees Celsius. Despite the cold, it's constantly blasted by intense radiation from the pulsar — no atmosphere can survive!

Phobetor — The Nightmare Beast!

Phobetor is named after a nightmare monster from Greek myths. It's about 4 times Earth's mass and orbits farthest from the pulsar, taking 98 days per orbit. Its rocky surface is very dense — almost twice as dense as Earth, with an iron core and a silicate mantle.

How They Were Found!

Astronomer Aleksander Wolszczan used the giant 305-meter Arecibo radio telescope in Puerto Rico. He noticed the pulsar's perfectly timed radio pulses were wobbling slightly — the planets' gravity was tugging the pulsar back and forth! It was called "the greatest discovery by a Polish astronomer since Copernicus."

Born From Death!

These planets could NOT have survived the supernova that created the neutron star. They are "second generation" planets — formed from the leftover debris AFTER the explosion. It's like building a new house entirely from the rubble of one that collapsed!

The Cosmic Lighthouse!

A pulsar shoots beams of radiation from its magnetic poles. As it spins, these beams sweep through space like a lighthouse beacon. Lich spins so fast (161 times per second!) that from the planets, the beams would look like a continuous glow rather than flashes.

A Teaspoon of Neutron Star!

Neutron stars like Lich are the densest objects in the universe (besides black holes). A sugar-cube-sized piece would weigh about a BILLION tons — as much as a mountain! All that mass is crammed into a ball smaller than most cities.

The Universe's Best Clock!

Millisecond pulsars are the most precise natural clocks in the universe. Lich's radio pulses arrive with microsecond precision — that's how Wolszczan detected the tiny wobbles caused by the planets. These pulses are so reliable they rival atomic clocks!

A Dangerous Neighborhood!

The planets are constantly bathed in intense radiation — X-rays, gamma rays, and charged particles streaming from the pulsar. Any atmosphere would be blasted away in just a few thousand years. These worlds are bare, rocky, and completely lifeless.

Glowing Skies!

If you could stand on one of these planets, the sky would be filled with spectacular glowing auroras — like the Northern Lights on Earth, but MUCH more intense! Charged particles from the pulsar would light up the sky in permanent, shimmering curtains of color.

Far Away in Virgo!

Lich is located about 2,300 light-years from Earth in the constellation Virgo. That means the radio pulses we detect left the pulsar around 300 BCE — when ancient Rome was just getting started and Alexander the Great had recently lived!

A Recycled Star!

Millisecond pulsars like Lich are called "recycled" pulsars. They started as normal neutron stars spinning slowly, but then a companion star dumped material onto them. This extra material spun the pulsar up to incredible speeds — like a figure skater pulling in their arms!

Proving They're Real!

At first, some scientists didn't believe planets could orbit a dead star. But in 1994, Wolszczan proved it by showing that Poltergeist and Phobetor were gravitationally tugging on each other — exactly as predicted! This confirmed they were real planets, not a mistake.

One in a Thousand!

Fewer than 0.5% of known pulsars have planets. The Lich system is extraordinarily rare — most pulsar companions are completely consumed, leaving the pulsar alone in space. These zombie planets survived in a very unusual sweet spot.

A Polish Discovery!

Aleksander Wolszczan was born in Poland, the same country as Nicolaus Copernicus — who discovered that Earth orbits the Sun back in the 1500s. Centuries later, another Polish astronomer showed that planets orbit OTHER stars too. What an amazing connection!

How It All Began!

Scientists think the Lich system formed when two dead stars (white dwarfs) merged together. The merger created the fast-spinning pulsar and left behind a disk of gas and dust. From that disk, three new planets slowly formed — a whole new solar system rising from the ashes!