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How do astronomers observing distant galaxies talk about looking backward in time?
The speed of light is not infinite. Light takes time to travel from distant galaxies to our eyes here on Earth. If a galaxy is 1 billion light years away, it has taken 1 billion years for the light emitted by said galaxy to reach us here, so (obviously) we are seeing the light emitted 1 billion years ago. In a sense, we are seeing 1 billion years into the past at the light emitted by that galaxy.
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Why is spring one of the best seasons to observe distant galaxies?
Spring is a good season for observing distant galaxies because it offers clearer skies with less atmospheric turbulence compared to other seasons. This results in better visibility of faint objects, allowing astronomers to capture more detailed images of distant galaxies. Additionally, spring nights are longer and have darker skies, providing more observing time for studying these celestial objects.
How does a spectroscope enable astronomers to determine the characteristics of distant stars and galaxies?
en.wikipedia.org/wiki/Spectroscopy
What destroyed the steady state theory?
Briefly, the Steady State theory assumes that the Universe looked the same in the past as it does now. Observations of distant galaxies showed that this is not the case - distant galaxies are quite different to the ones that are closer by. Note that if you look at distant galaxies, you are observing the past of the Universe, because of the time it takes light to get here. That evidence played a part, but it was the detection of the "cosmic microwave background radiation". That was what convinced most astronomers that the Big Bang Theory was correct.
Why do scientists study distant galaxies to learn about galaxies?
Scientists study distant galaxies to understand the formation, evolution, and properties of galaxies over time. By observing galaxies that are far away, they can explore the universe at different epochs and gain insights into how galaxies have changed and evolved since the early universe. Studying distant galaxies also helps scientists refine theories about the laws of physics and the nature of the universe as a whole.
How can astronomers infer approximately how long the universe has been expanded?
Astronomers can determine the expansion of the universe by observing the cosmic background radiation, and the red- or blue-shifting of distant objects.
Based on the observed red shifts in the spectral lines of distant galaxies?
Astronomers conclude that the universe is expanding, because wavelengths are increasing.
When astronomers study distant galaxies they notice changes to the waves they observe describe the change to the waves they observe?
Because the universe as a whole is expanding, distant galaxies are moving away from us. As a result, electromagnetic waves emitted by those galaxies experience what is known as a red shift. Their wavelengths get longer.
Ultraviolet wavelength telescope to look at distant galaxies?
For Earth-based telescopes this is not a particularly good idea since the ozone layer in the Earth's atmosphere absorbs some of the UV radiation. For space based telescopes, all wavelengths are useful.
The visible part of distant galaxies is the galaxies what?
The "nucleus".
How can scientists utilize the technique of observing very distant objects to gain insights and knowledge about the universe?
Scientists can utilize the technique of observing very distant objects, such as galaxies and stars, to gain insights and knowledge about the universe by studying the light emitted from these objects. By analyzing the light's properties, such as its spectrum and intensity, scientists can learn about the composition, temperature, and movement of these distant objects. This information helps scientists understand the evolution of the universe, the formation of galaxies, and the behavior of celestial bodies.
Why are large telescopes used to study distant galaxies and not small telescopes?
Large telescopes are used to study distant galaxies because they can gather more light, allowing for better resolution and the ability to detect fainter objects. Their larger size also grants them a greater light-gathering capacity, which is essential for observing objects that are billions of light-years away. Additionally, large telescopes offer higher sensitivity and better data collection capabilities, enabling astronomers to analyze and study distant galaxies in greater detail.
The Doppler effect applies to light waves as well as sound waves. Astronomers use this to measure the motion of stars and galaxies. In 1929 Edwin Hubble discovered that light from distant galaxies was?
shifted to longer wavelengths, indicating that the galaxies were moving away from us. This observation led to the development of the theory of the expanding universe.
