The main mirror of the telescope has a diameter of 2.4 m and the secondary mirror is 0.34 m. The distance between them is strictly reconciled and is 4.9 m. The optical system allows light to be collected into a beam of 0.05 inches in diameter (even the best telescopes on Earth have a scattering circle greater than 0.5 inches). The resolution of the Hubble telescope is seven to 10 times greater than that of its counterparts on Earth.
With this exposure, a very high degree of stabilization and accuracy of guidance on the object is necessary. This was the main difficulty in the design — as a result, a complex combination of sensors, gyroscopes and star guides allows you to keep the focus within 0.007 inches for a long time ( guidance accuracy at least 0.01 inches).
Six major scientific instruments are installed on board, the latest achievements of scientific thought at the time of the shuttle launch. These are Goddard’s high-resolution spectrograph for ultraviolet operation, camera and spectrograph for shooting dim objects, planetary and wide-angle cameras, high-speed photometer for observations of objects with variable brightness and precision guidance sensors. For
the system to be self-sufficient and not need power supplies, the telescope is equipped with powerful solar panels, which in turn charge six hydrogen-nickel batteries. All computers, batteries, telemetry and other systems are located so that they can be replaced without problems if necessary.