Think it deserves a separate topic...
James Webb Space Telescope will be the largest and most powerful space science telescope ever constructed. Remember the Hubble Space Telescope? Well, JWST is designed to observe a part of space and time never seen before, the epoch when the very first stars and galaxies formed over 13.5 billion years ago. In order to do this, Webb will have a much larger primary mirror (6.5m diameter) than Hubble, giving it more light-gathering power. It also will have infrared instruments with longer wavelength coverage and greatly improved sensitivity than Hubble. Finally, Webb will operate much farther from Earth, maintaining its extremely cold operating temperature, stable pointing and higher observing efficiency than with the Earth-orbiting Hubble.
The Webb mission, an international partnership of NASA, ESA (European Space Agency) and the Canadian Space Agency, will explore every phase of cosmic history – from within the solar system to the most distant observable galaxies in the early universe, and everything in between.
JWST will also be a powerful tool for studying the nearby universe. Scientists will use it to study planets and other bodies in our solar system to determine their origin and evolution and compare them with exoplanets, planets that orbit other stars. It will also observe exoplanets located in their stars’ habitable zones, the regions where a planet could harbor liquid water on its surface, and can determine if and where signatures of habitability may be present. Using a technique called transmission spectroscopy, the observatory will examine starlight filtered through planetary atmospheres to learn about their chemical compositions.
JWST is targeted to launch at 12:20 p.m. GMT Friday, Dec. 24, on an Arianespace Ariane 5 rocket from Europe’s Spaceport in Kourou, French Guiana, on the northeastern coast of South America. Weather-related delays are possible, a new update should be released on December 21st.