Question

At present, what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?

A) by searching for planets around distant stars
B) by using large X-ray telescopes to search for signals from extraterrestrial civilizations
C) by using radio telescopes to search for signals from extraterrestrial civilizations
D) by analyzing high-resolution images of nearby stars in search of evidence of structures that could not

Answer 1

SETI primarily uses radio telescopes to search for extraterrestrial signals, focusing on radio waves to detect possible communications from advanced civilizations. The correct option is c.

Step-by-step explanation:

The primary way that the search for extraterrestrial intelligence (SETI) is currently carried out is C) by using radio telescopes to search for signals from extraterrestrial civilizations. This technique relies on the detection of electromagnetic waves, specifically radio waves, which are well-suited for long distances in space.

SETI researchers utilize powerful radio telescopes, such as the Allen Telescope in Northern California and the Green Bank Telescope in West Virginia, to scan the cosmos for signals. These telescopes allow for simultaneous searches on millions of frequencies, which helps in addressing the cosmic haystack problem of identifying the right frequency.

While some researchers are also looking for pulses of visible light or infrared signatures that might indicate large constructions by advanced civilizations, most efforts are concentrated on radio signals that could include accidental leakage, similar to Earth's, or intentional beacons aimed at drawing attention to themselves. The correct option is c.