Paragraftan Çıkarım (Inference)Soru #10399
Unveiling the Cosmic Dawn
The James Webb Space Telescope (JWST), positioned nearly a million miles from Earth at the Second Lagrange Point (L2), has revolutionized observational astronomy since its deployment. Equipped with a gold-coated primary mirror measuring 6.5 meters across and ultra-sensitive infrared detectors, JWST can peer through dense cosmic dust clouds that previously obscured the view of optical telescopes like Hubble. Infrared sensitivity is crucial because light emitted by the earliest stars and galaxies billions of years ago has experienced cosmological redshift, stretching its wavelengths toward the infrared spectrum as the universe expanded. Initial observations have revealed massive, highly structured galaxies that formed just a few hundred million years after the Big Bang, challenging preexisting models of stellar evolution which posited that galaxy assembly required much longer timescales. As astronomers continue to analyze high-resolution spectroscopic data, the telescope promises to yield unprecedented insights into the origins of planetary systems and the atmospheric compositions of distant exoplanets. According to the passage, why is infrared capability indispensable for observing the earliest galaxies?
- A)Because infrared rays are the only radiation that can penetrate Earth's dense ozone layer
- B)Because optical mirrors cannot survive the freezing temperatures of deep outer space
- C)Because universal expansion has stretched the light from early celestial bodies into infrared wavelengths
- D)Because cosmic dust completely destroys all infrared photons before they reach detectors
- E)Because visible light moves significantly slower than infrared radiation through space
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Doğru cevap: C) Because universal expansion has stretched the light from early celestial bodies into infrared wavelengths
Çözüm: Metindeki "light emitted by the earliest stars... has experienced cosmological redshift, stretching its wavelengths toward the infrared spectrum as the universe expanded" ifadesi C şıkkını doğrudan kanıtlar. Doğru cevap C'dir.