original: It was not detected again until the Hubble Space Telescope observed it in 1997.
simplifications: The Hubble Space Telescope didn't see it again until 1997. It was not found again until the Hubble Space Telescope saw it in 1997. The Hubble Space Telescope observed it again in 1997. It was not detected again until the Hubble Space Telescope saw it in 1997. It was not detected again until the Hubble Space Telescope in 1997. It was next seen by the Hubble Space Telescope in 1997. It was hidden until the Hubble Space Telescope saw it in 1997. It wasn't seen again until the Hubble Telescope saw in in 1997. It was not spotted again until it was observed by the Hubble Space Telescope in 1997. It was no found again until the Hubble Space Telescope saw it in 1997.