original: it was not detected again until the hubble space telescope observed it in 1997 .
simplifications: it was not seen again until the hubble space telescope saw it in 1997 it was detected again when it was observed in 1997 by the hubble space telescope . it was not discovered again until the hubble space telescope saw it in 1997 . it was not detected again until hubble space telescope observed it in 1997 . it was not detected again by the hubble space telescope watched / followed it in 1997 . it was not noticed again before the hubble space telescope observed it in 1997 . it was not seen again until the hubble space telescope saw it in 1997 . it was not seen again until the hubble space telescope spotted it in 1997 .