Which is an advantage of using space observatories for space exploration?

The advantage is to avoid the effects of light pollution.

Explanation:

There are several reasons why space observation is desirable in order to avoid problems that terrestrial observatories have. An example of this is that the space observatory does not suffer from the interference of city lights, avoiding light pollution. In addition, thermal turbulence (present in the atmosphere) also does not alter the telescope image.  The terrestrial atmosphere, having a spherical shape, acts as a lens that distorts images (a fact known as optical aberration), so the resolution of terrestrial images has a significant reduction. The atmosphere of our planet also absorbs an important portion of the electromagnetic spectrum (infrared and ultraviolet rays, for example), so some observations are virtually impossible to make.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: