I don't know that each space telescope is explicitly designated as the successor to an earlier one, but ... -- The 'Kepler' was launched recently with the primary mission of searching for extra-solar planets, and has already delivered evidence of hundreds of them. -- The 'James Webb' is in the final stages of assembly and test before launch.
The surprising thing to me is how MANY extra-solar planets have been discovered. Considering the limitations of the Kepler Space Telescope's design, this indicates that there may be planets around a majority of the stars.
Extra solar planets are planets that is outside of our solar system.
No Earth-like planets have been discovered yet, but our best telescopes are (so far!) incapable of locating any extra-solar planets that small. With the launch of the James Webb Space Telescope, this may change.
In our solar system, there are eight known planets; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. There are five known "dwarf planets", and probably thousands more that have not yet been discovered. And there are hundreds of thousands, probably millions, of asteroids. Beyond our solar system, the Kepler Space Telescope has found evidence of a thousand or more extra-solar planets. Given the limitations of the design and functioning of the Kepler telescope, this raises the probability that the majority of stars may possess planetary systems; if so, the likely number of planets within the Milky Way galaxy could be in the trillions.
Extra solar (or Exo) planets are planets that do not orbit the Sun. Planets in our solar system orbit the Sun.
They have been searching for evidence using a complex sound system to listen for radio waves from extra terrestrial intelligence.
Eight
There are a couple of techniques. The one used by the Kepler Space Telescope uses the tiny differences in the apparent brightness of a distant star when a planet passes between that star and the Kepler Space Telescope. By analyzing the light patterns over a period of time, we can calculate the orbital period of the planet around the star. Please note that in order for this to work, the distant solar system's orbital plane must be precisely aligned with the Earth; if the orbital plane were tipped even slightly, the planet would never pass between the Kepler and the star. So it's pretty limited in which planets it might detect. However, the fact that the Kepler Space Telescope has discovered thousands of extra-solar planets means that planets must be as common as dirt. We used to believe that planets might be rare; now we're pretty sure that they are quite common.
Fomalhault
The Hubble telescope might need an extra solar panel to increase its power supply, especially if the existing panels degrade over time or if new instruments are added that require more energy. This would ensure that the telescope continues to function effectively and gather important data from space.
yes, for example us and the rest of the planets in the solar system. to date there are also approx 400 extra solar planets discovered (planets beyond our solar system)