course material

1. The radio telescope invention is accredited to Kari Guthe Jansky.
The radio telescope invention is accredited to Kari Guthe Jansky. A radio telescope is
basically a specialized antenna and radio receiver used to detect radio waves from
astronomical radio sources (i.e., moon, stars, planets, etc.) The field of study is called Radio
Astronomy and studies the radio frequency portion of the electromagnetic
spectrum (E.M.). Traditional telescopes study these same astronomical objects
by analyzing the light wave portion of the electromagnetic spectrum. Since radio waves
are at the lower frequency and relative weaker range of the EM spectrum, they are
collected and amplified by the radio telescope antenna and receiver. These waves can then
be analyzed. The general wavelength range of these waves are from 1 millimeter to
10 meters long. Therefore, we usually refer to radio waves in terms of their frequencies
instead of their corresponding wavelengths. This is also why radio telescopes are the world
largest telescopes with the most sensitive receivers. Early radio telescopes had a serious
limitation in that they had to be tuned to one specific frequency. With vast improvements in
modern electronic technology, radio receivers and computers can divide the frequency
band into several thousand separate channels that may range from over tens to hundreds
of megahertz. This modern improvement in radio telescope technology provided a great
advantage when compared to optical telescopes. Another advantage is that radio telescopes
can be used both day and night.Radio telescopes like the Long Wavelength Array,
seen here, do not need accurate dish surfaces to detect radio waves from space. These use
dipole antennas in a cross-shape. ReferenceNational Radio
Astronomy Observatory. What are Radio Telescopes? (2022). What are Radio Telescopes? –
National Radio Astronomy Observatory (nrao.edu)Links to an external site.