Quote:
| Originally Posted by ssjaken dude i agree if they made a new hubble it would be soo epic win for the people of earths
lets get a petition for a new hubble |
No need. A replacement is being built right now.
The James Webb Space Telescope will have a 6.5 meter (21.3 foot) diameter mirror.
It was initially called the Next Generation Space Telescope.
It will orbit about 1.5 million km (1 million miles) from the Earth.
The launch is planned for no sooner than 2013 by a Ariane 5 from Kourou, French Guiana.
The Hubble Space Telescope has a 2.4 m (7.8 foot) diameter mirror.
It orbits the earth at 600 km (325 nautical miles).
It was launched on April 24, 1990 using a Space Shuttle.
The Hubble Space Telescope can service by the Space Shuttle because its orbit is low enough.
The James Webb Space Telescope can't be serviced after launch because it will be too far away to reach.
It will be so far away because it needs to be at the Sun-Earth L2 Lagrange point. At that point the position
the Earth and Sun will occupy the same relative positions. That will allow its sunshade to constantly
block the sun's light to allow it to effectly receive the light from infrared sources.
The mirror for the James Webb Space Telescope will be made up of 18 hexagonal pieces. After each segment is
completed it will be shipped to NASA's Marshall Space Flight Center in Huntsville, Alabama (my home town) where
it will tested before being assembled into a complete mirror at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Note: the L2 Lagrange point is 1 million miles farthur from the Sun than the Earth is. If you draw a line
from it to the sun the Earth will lie on a point on that line. Normally an object orbiting the sun farthur than the
Earth would take longer to orbit the Sun than the Earth does. Because of the influence of Earth's gravity an object at
the L2 point will orbit the Sun in a period the same as the Earth (365 days).
L2 <1 million miles> Earth <93 million miles> Sun
The James Webb Space Telescope
What are Lagrange points?