Astronomers Spot a New Earth-Sized World Right Next Door
The News
Astronomers at UC Irvine just announced they've found a new world! It's called GJ 3378b. It's about twice the size of Earth and orbits a star only 25 light-years away — which, in space terms, is practically next door. Best of all, it sits in the "habitable zone": the cozy ring around a star where it's not too hot, not too cold, and where liquid water could exist. Scientists still don't know if the planet has an atmosphere, but a giant new space telescope being built right now will help us find out.
Professor Pip set down his picnic basket and patted his pockets. "Ah, here we are — yes — and yes —" Out came a small brass telescope, a thermos of cocoa, and three steaming little mugs.
Mia, Leo, and their friend Sofia plopped onto the picnic blanket. The sky above their hilltop was deep, velvety indigo, sprinkled with bright stars.
"Tonight," said Pip, "we are house-hunting."
"For a new house?!" Sofia squeaked.
"Not for us. For anyone." Pip aimed his telescope at a tiny reddish star. "This is GJ 3378. Just a quiet little red star, going about its business. And as of this week, astronomers know it has a brand new world orbiting it."
"A planet?" asked Leo.
"Exoplanet," said Pip. "That just means 'a planet that orbits another star.' Our Sun has eight planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. But every star in the sky? Many of them have planets too! And this new one — GJ 3378b — sits in something astronomers call the habitable zone."
Mia raised her cocoa mug. "Habitable like… houses?"
"In a way. Watch." Pip pulled out a small candle, lit it carefully, and gestured. "Hold your hand close. Too close — ouch! Pull it back. Far away — too cold, can't feel it. But somewhere…" he guided Sofia's hand to just the right spot, "…it's perfect. Toasty, but not burning."
"That's the Goldilocks place!" Sofia laughed.
"Exactly right!" Pip beamed. "Astronomers call it 'just right' for water — not boiled away, not frozen solid. And water, my dears, is where life on Earth got its start. Find liquid water on another world, and you might find… something."
"Aliens?!" Leo nearly knocked over his cocoa.
"Easy now — we don't know yet," said Pip, gently. "We don't even know if GJ 3378b has an atmosphere — the blanket of gases that keeps a planet's water from drifting away into space. But scientists are building an enormous new space telescope to look. And here is the truly wonderful part."
He swept his paw across the stars. "GJ 3378b is only 25 light-years away. That sounds far. But our galaxy is one hundred thousand light-years across. So as galaxies go, this little planet is practically right next door."
Mia stared up. "Curiouser and curiouser," she whispered.
"Now I wonder…" said Pip softly, "if someone over there is staring back at us, sipping their own cocoa."
Spark a Conversation
- If you could pack one thing into a backpack to send to GJ 3378b, what would it be?
- Why do you think water is so important for life — what does it do that other liquids can't?
- Light from GJ 3378b took 25 years to reach us. What were you doing 25 years ago? (Trick question!)