Facts for Kids

Imagine a giant eye in the sky that can see things too far away for regular telescopes. That's what e-MERLIN is—a super team of radio telescopes spread across England. They work together like friends holding hands to make one huge telescope. This lets them spot tiny details in space, like stars being born or black holes hiding in galaxies.

Run from Jodrell Bank Observatory in Cheshire, e-MERLIN catches invisible radio waves from space. These waves come from cool places like exploding stars or distant planets. The telescopes stretch over 217 kilometers, acting as one giant dish as big as a small country. This setup gives sharp pictures, almost as clear as the Hubble Space Telescope's views of colorful galaxies.

Because they team up, e-MERLIN helps scientists learn secrets about our universe.

e-MERLIN uses up to seven special radio telescopes. The biggest is the giant Lovell Telescope at Jodrell Bank, like a huge spinning dish catching whispers from space. Others include the Mark II, Cambridge, Defford, Knockin, Pickmere, and Darnhall telescopes. They sit in different spots across England.

These telescopes listen to radio waves at frequencies from 151 MHz to 24 GHz. That's like tuning into different radio stations from space. By linking them over 217 kilometers—the longest distance between any two—the array sees tiny details, down to 40 milliarcseconds at 6 cm waves. That's sharper than many eyes on Earth!

Working as a team, called an interferometer array, they create pictures clearer than one telescope alone.

e-MERLIN has made some truly exciting finds in space! One big discovery happened when it teamed up with the Hubble Space Telescope in 1998. Together, they spotted the first Einstein ring. This is a rare circle of light bent around a distant galaxy by gravity, like a cosmic hula hoop. It proved Albert Einstein's ideas about space and gravity were spot on.

Another cool find came from studying Messier 87, a giant galaxy that glows brightly in radio waves. e-MERLIN revealed hidden details in its jets of speedy particles shooting out from a black hole at the center. These jets stretch millions of light-years!

It has also watched faraway quasars, super-bright centers of ancient galaxies powered by black holes. By linking with other telescopes, e-MERLIN helps map gas clouds and measure star positions with amazing accuracy.

Long ago, in 1973, scientist Henry Proctor Palmer had a big idea. He wanted to connect telescopes at Jodrell Bank with faraway ones using radio links. This dream started building in 1975, with money approved that May.

At first, it was called MTRLI, but soon became MERLIN—Multi-Element Radio-Linked Interferometer Network. They built new telescopes, like Knockin, and added microwave links and a computer to mix signals. By 1976, the first parts were ready, and real sky-watching began in 1980.

This teamwork made MERLIN a star-spotting powerhouse, helping discover hidden space wonders.

MERLIN was great, but scientists dreamed bigger. In 2008, they planned e-MERLIN, swapping old phone-line links for fast internet fibers. This upgrade would make pictures even sharper and faster.

There were money worries—a big shortfall scared everyone. But experts talked it over at meetings and pushed it up the list. They saw e-MERLIN as key for UK space studies and future giant projects like the SKA.

By agreeing to share costs, they moved forward. The upgrade turned MERLIN into e-MERLIN, a world-class space viewer ready for new discoveries.