Observing Stars Essay

By the radiation and reflection of light, the sky can be seen at night. "Light" is a well-known term in the electromagnetic spectrum including visible, ultraviolet, infrared, microwave, radio, x-ray and gamma ray regions. Since the size of the spectrum is so large, none of the regions are unique, and several regions overlap each other.

Each of these regions of the electromagnetic spectrum represents transverse waves that interact perpendicularly to one another and proceed as electric and magnetic fields with different wavelength ranges. The magnetic field vibrates vertically, the electric field vibrates horizontally, and each magnetic field induces a different magnetic field.

Therefore, telescopes used by astronomers on the ground are classified as optical telescopes and radio telescopes. An optical telescope functions by focusing light from an object and using a lens or a curved mirror to form an image to reflect or refract light. The radio telescope consists of a parabolic reflector and a receiver. The ability to collect and resolve depends on the diameter of the antenna. Radio observation is not affected by weather and time, radio waves are long wavelength, convection of dust and atmosphere in the universe is not a problem. Radio astronomy is used for chemical analysis of elements (by luminescence and absorption spectroscopy), detection of body motion by Doppler effect, investigation of early universe and big bang. We can analyze radio waves from the center of galaxies including our own galaxy

Despite the windows, there are still wavelengths that can not pass through the atmosphere. Some radio waves are reflected from the ionosphere (flow of charged particles from solar ion gas molecules) which is part of the thermal layer. This is photoionization. Ultraviolet rays, X-rays and gamma rays are also absorbed by this layer

Gravitational wave astronomy is a field of observation astronomy observing gravitational waves using gravitational waves, such as a binary system consisting of white dwarfs, neutron stars, and black holes, and events of supernovae that occurred just after the big bang. . On 11th February 2016, LIGO and Virgo Scientific Collaboration announced the direct observation of the first gravitational wave. It was observed five months earlier on 14th September 2015 using the Advanced LIGO detector. Gravity waves are generated from a pair of black holes coupled. After the initial announcement, the LIGO device also detected two confirmed events and one potential gravity wave event.

The observation of the gravitational wave is supposed to supplement the observation of the electromagnetic spectrum. They generate information about the initial universe process including black holes, other dense objects such as neutron stars and white dwarfs, information about certain supernova explosions, and the characteristics of certain imaginary cosmic strings It is expected. In February 2016, the senior LIGO team announced that they found a gravitational wave from the Black Hole merger.