The Hubble Space Telescope has been another source of astonishing images, although when it first launched in 1990, the initial photographs sent back were all blurry due to a fault with the main mirror (it was fixed after three years following a special 11-day mission).
Hubble's successor, the James Webb Space Telescope, is scheduled to launch in 2021, after several delays.
"James Webb is going to operate at a very great distance from the Earth, and it's not going to be easy -- if indeed possible at all -- for astronauts to service it if something goes wrong," said Bizony. "That's why everybody's being so cautious about getting it in good order before it launches."
Astronaut Dave Scott looks at planet Earth from the hatch of Apollo 9 in March 1969. Credit: NASA
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