Detay bilgiSoru #10400
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. The author points out that initial JWST observations challenged existing cosmological models because ----.
- A)no stars were found to have formed during the first billion years after the Big Bang
- B)massive and structured galaxies were discovered much earlier in cosmic history than theorists previously anticipated
- C)exoplanet atmospheres turned out to be devoid of any molecular compounds
- D)the Second Lagrange Point proved too turbulent for stable mirror orientation
- E)optical telescopes had vastly overestimated the size of the observable universe
Cevabı ve çözümü göster
Doğru cevap: B) massive and structured galaxies were discovered much earlier in cosmic history than theorists previously anticipated
Çözüm: Metinde erken dönemde devasa yapılandırılmış galaksilerin Big Bang'den birkaç yüz milyon yıl sonra var olduğunun bulunması, galaksi oluşumunun daha uzun süreceğini savunan önceki modelleri sarsmıştır. Doğru cevap B'dir.