مقایسهٔ روش‌ها

	21 سانتی‌متر عصر بازynization	تحلیل ناهمسانگردی تابش زمینه کیهانی
حوزه	نجوم	نجوم
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	1990	1965
پدیدآور	David Scott	Arno Penzias
نوع	Radio observational method	Observational cosmological measurement
منبع بنیادین	Scott, D., & Rees, M. J. (1990). The 21-cm signature of the ionization of the intergalactic medium. Monthly Notices of the Royal Astronomical Society, 247, 510-516.	Penzias, A. A., & Wilson, R. W. (1965). A measurement of excess antenna temperature at 4080 Mc/s. Astrophysical Journal, 142, 419-421.
نام‌های دیگر	EoR 21-cm, Hydrogen Line Observations, 21-cm Signal Mapping	CMB Power Spectrum, CMB Anisotropies, Microwave Background Analysis
مرتبط	3	3
خلاصه	The 21-centimeter line observation of neutral hydrogen is a powerful technique for studying the Epoch of Reionization, when the first stars and galaxies ionized the intergalactic medium about 13 billion years ago. Proposed by Scott and Rees in 1990, this method probes the universe's transition from the dark ages to the cosmic dawn through the characteristic hyperfine line emission of hydrogen.	The Cosmic Microwave Background is the ancient light from when the universe first became transparent, about 380,000 years after the Big Bang. Its tiny temperature variations (anisotropies) across the sky encode a wealth of information about the universe's composition, geometry, and history. First discovered by Arno Penzias and Robert Wilson in 1965, detailed measurements of CMB anisotropies have become the most powerful probe of cosmology.