Webb's launch delayed to 2021 at an extra cost of nearly $1 billion – Spaceflight Now
Hubble Telescope's Silver Anniversary - Sky & Telescope - Sky & Telescope
Hubble detects changes in universe's rate of expansion that cannot be explained by current physics | Daily Mail Online
As Hubble telescope reaches its quarter century 25 facts about it - Mirror Online
How did the Hubble Space Telescope come about? | BBC Sky at Night Magazine
Scientists and engineers push for servicing and assembly of future space observatories - SpaceNews
Hubble Space Telescope - Wikipedia
NASA's new space telescope costs shoot the moon (Update)
NASA and SpaceX Investigating Hubble Telescope Orbital Reboost To Add Years to Its Operational Life
NASA And SpaceX Consider Daring Plan To 'Reboost' The Hubble Space Telescope
File:Hubble Space Telescope Support Systems Module (27712253693).jpg - Wikimedia Commons
James Webb space telescope cost NASA billions. The pictures are worth it.
Telescopes on the ground may be cheaper, but Hubble shows why they are not enough
NASA Is Studying a Private Mission to Boost Hubble's Orbit. Is It Worth the Risk? - Scientific American
None Of Us Is Perfect — Not Even The Venerable Hubble Space Telescope : NPR
Elon Musk's SpaceX Offers to Rescue Hubble, but Isn't First - IEEE Spectrum
Comparing the veteran Hubble vs. the new Webb space telescope - Los Angeles Times
How much is the cost of the most advanced and expensive earth based telescopes? What can you see with them? - Quora
Hubble Space Telescope: history and facts | BBC Sky at Night Magazine
Scientists Undeterred By Hubble Successor's Costs : NPR
Telescopes on the ground may be cheaper, but Hubble shows why they are not enough
Hubble Space Telescope: Pictures, facts & history | Space
Hubble versus James Webb: How the 2 powerful telescopes compare
