James Webb Space Telescope is created to peer even further back into time than the Hubble, probing the earliest dawn of the universe, the formation of stars and phenomena too distant to explore with current technology.
Even though, the telescope and instruments have been passed the standalone tests, the team who is in charge of developing the satellite is now running under some problems, NASA informed.
Past year in September, NASA was hoping to launch the telescope in 2018, however, due to issues with the assembly, the project launch was postponed to 2019.
NASA says the Webb telescope will serve as the "premier observatory" for the next decade - whenever it launches - as it will aim to serve thousands of astronomers around the world.
The latest delay will put the Webb above an $8bn budget limit set by congress, forcing Nasa to request additional funds.
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NASA has been planning to launch a powerful new telescope that can see across the universe and perhaps to the beginning of time for many years now.
"Considering the investment NASA and our global partners have made, we want to proceed systematically through these last tests, with the additional time necessary, to be ready for a May 2020 launch", says Thomas Zurbuchen, associate administrator for NASA's Science Mission Directorate. The brightness of these target stars will allow researchers to use spectroscopy, the study of the absorption and emission of light, to determine a planet's mass, density, and atmospheric composition.
Some mistakes were made while preparing the telescope, which slowed work. NASA said Tuesday the delay was caused by a mix of "avoidable technical errors" and estimates for testing that proved too optimistic.
"Webb has already completed an extensive range of tests to ensure it will safely reach its orbit at almost one million miles from Earth and perform its science mission". Hubble lifted off in 1990 with a flawed mirror that blurred its vision; spacewalking astronauts had to fix it in 1993. You've heard this previously, and also it proves out for Webb: For us, truly, failing is not a choice ... "For us, really, failure is not an option". The delays, when it comes to NASA's James Webb Space Telescope, are not rare. "However, it looks like we have a ways to go before we cross that finish line", said Thomas Zurbuchen, NASA associate administrator for science, in a teleconference with reporters that itself experienced an interruption due to a glitch. If it surpasses its current $8.8 billion budget, the project will have to be re-approved by the US Congress, says Thomas Zurbuchen of NASA's Science Mission Directorate. He promised Congress would receive a detailed report on schedule and cost this summer. All its parts are now at Northrop Grumman Aerospace Systems in Redondo Beach, California. Both halves of the 13,500-pound observatory now are together in the same facility for the first time.
But Mr Zurbuchen said the two missions are different in design, if not in importance.
In addition to a mirror 21 feet (6.5 meters) across, Webb will sport a five-layer sunshield the size of a tennis court so it can make infrared observations at frigid temperatures.