How Space Telescope Works
How Space Telescope Works
What is Space Telescope
A space telescope is a telescope placed beyond the atmosphere. The space telescope has the advantage over its terrestrial, counterpart of not disturbed by the Earth’s atmosphere. This distorts the light radiation in the visible.
The progress of astronautics made it possible. starting in the 1960s, to send space telescopes of various types into space. the most famous being the Hubble Space Telescope. These instruments now play an important role in gathering information about stars, galaxies, distant planets, and other celestial objects.
Characteristics of a space telescope
Space telescopes are telescopes set up in space. space telescope in space observes distant planets, galaxies, and other celestial objects.
Space telescopes are of two broad categories:
- telescopes observing the entire celestial vault.
- telescopes that make observations on selected fractions of the sky.
Technical Description of Hubble Space Telescope
The Hubble telescope has a mass of about 11 tons, measures 13.2 meters long, has a maximum diameter of 2.4 meters and cost US $ 1 billion (about US $ 50 million a year), including the US $ 76 million. for the last mission extension to date (2013-2016). It is a reflector telescope with two mirrors.
the primary mirror alone measures about 2.4 meters in diameter and has cost more than $ 350 million. It is coupled with various spectrometers as well as three cameras: one with a wide field for the weakly luminous objects, another with a narrow field for the planetary images and the last one reserved for the infrared field.
Operation of optics
The optical assembly of the Hubble telescope consists of two mirrors. This system is a Ritchey-Christian design. It is a particular Cassegrain telescope. hubble telescope is to eliminate the optical aberration known as the coma. This type of telescope provides a relatively large field of view compared to a more conventional design. In the Ritchey-Chrétien telescope, the primary mirror and the secondary mirror are hyperbolic.
The light enters the Hubble aperture and travels down the speaker. The speaker is a surface that eliminates the light lost.
The light reflects by the primary mirror which measures approximately 2.4 meters in diameter. Because of the concave shape, the primary mirror converges light to the secondary mirror by a second cylinder.
The secondary mirror, measuring approximately 0.3 m in diameter, receives light. It, in turn, reflects the convergent light back towards the primary mirror by a central cylinder.
The light travels through a hole in the primary mirror. reaches the focus (focal plane), where the science instruments examine the light.