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Zorluk: ZorStars, Galaxies, and the Universe

Fill in the blanks to complete the scientific description of cosmic expansion and astronomical measurement.

Cevap:Astronomers determine that distant galaxies are receding from the Milky Way by observing 【redshift】, which is the lengthening of emitted electromagnetic wavelengths, and they quantify the vast intergalactic distances across the universe using 【light-years】 as a unit of distance.

Cevap

blank_1: redshift; blank_2: light-years
Redshift describes the elongation of spectral wavelengths toward the red end of the spectrum, which provides direct evidence that distant galaxies are moving away as the universe expands. Light-years are the standard unit of distance used to express these immense spans between galaxies.

Adım Adım Çözüm

1
Identify the spectral phenomenon associated with recessional galactic motion.
Light emitted by objects moving away from an observer stretches to longer wavelengths toward the red end of the spectrum, a phenomenon called redshift.
The expansion of space causes the wavelength of light traveling across cosmological distances to increase.
2
Determine the standard astronomical unit used to quantify distances between galaxies.
A light-year represents the distance light travels through a vacuum in one Julian year (approximately 9.46×1012 km9.46 \times 10^{12}\text{ km}).
Intergalactic space requires massive distance units such as light-years rather than planetary-scale units like kilometers or astronomical units.

Anahtar Kavram

Galactic redshift and astronomical distance units
Tahmini Süre:1m 30s
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Stars, Galaxies, and the Universe

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