The Big Red Star Had a Secret Friend All Along

Professor Pip adjusted his slightly crooked spectacles and patted the bulging pockets of his forest-green lab coat until he found what he wanted. Out came his small brass telescope, cool and heavy in his paw.

"Ah! Just what we need for a starry evening like this."

Mia and Leo were sitting cross-legged on the hilltop grass, their heads tipped back. Above them, the sky was crackling with stars.

"See that big orange one, on the shoulder of Orion?" said Pip, pointing his paw. "That is Betelgeuse. She is so enormous that if she sat where our Sun sits, she would swallow up all the planets out to Jupiter."

"Whoaaa," said Leo. His tail (imaginary) swished.

"For a hundred years," Pip whispered, "everybody thought Betelgeuse was alone up there. But some astronomers said, 'Wait — what if she has a friend hiding right next to her, and we just cannot see it because she is too bright?'"

Mia frowned. "How could you not see it? A star is a STAR."

"Let me show you." Pip fished a small lantern out of another pocket and clicked it on. Then he pulled out a firefly in a jar. He held them right next to each other and lifted them up. "Look. Where is the firefly?"

The children squinted. "I can't see it!" said Leo. "The lantern is too bright!"

"Precisely!" Pip's tail swished happily. "Right next to something dazzling, a tiny light seems to disappear. That is called glare. To spot the little friend, we have to block out the big bright thing." Pip lifted a paw-sized card and slid it in front of the lantern. Suddenly — PLINK! — the firefly's tiny glow was easy to see, floating there in the dark.

"That is exactly what the astronomers did," Pip said. "They pointed a giant telescope called the VLT — the Very Large Telescope, high in the mountains of Chile — right at Betelgeuse. Then they used a clever tool to block Betelgeuse's blinding light. And there, right where they had hoped, was a small star swirling around her. They named it Betelgeuse B. It has been there the whole time, tugging on her by gravity like a friend holding hands and spinning."

"Like the moon around the Earth!" Mia gasped.

"Exactly right, Mia," said Pip, beaming.

They lay back and watched Betelgeuse quietly for a while. Somewhere up there, Pip thought, two enormous suns were spinning gently around one another — and had been all along.

"Now I wonder," Pip said softly, "how many other lonely-looking stars have friends we simply have not seen yet…"