Deorbit Hubble and attach it to the ISS.
Since the Hubble is 590 km above the earth (or 6960 km from the centre of the earth) and the ISS is 500 km above the earth (or 6378 km from the center of earth), use a well timed deorbital burn could send Hubble slowing coasting to the ISS.
ok. However, at some point each orbit must cross the other, so if timed properly...
Deorbit Hubble and attach it to the ISS. Since the Hubble is 590 km above the earth (or 6960 km from the centre of the earth) and the ISS is 500 km above the earth (or 6378 km from the center of earth), use a well timed deorbital burn could send Hubble slowing coasting to the ISS.