The picture — of two galaxies forming a “10” out in the darkness of space in the constellation Cetus, 400 million light years away — is typical of the Hubble Space Telescope. Which means that it’s out-of-this-world beautiful. It’s also proof that after a month of unexpected, worrisome darkness, Hubble has returned to life. “Isn’t it fabulous?” said Ridgefield planetary astronomer Heidi Hammel, who uses Hubble for her work studying Uranus and Neptune. “I’m really glad to know that.”