QUESTION 10What curvature will the universe have if the matter and energy density of the universe is equal to the critical density?OpenClosedFlatO None of the aboveQUESTION 11Why can you not observe beyond the horizon distance?O Because of opaque gasO Because our telescopes are not powerful enoughO Because light/information cannot travel faster than the speed of lightO Because of theof black holesQUESTION 12According to the Olber's Paradox, the night sky should be completely bright. However, when we observe at night, the sky is dark. Why does this happen?O Because the universe has a finite ageO Because as the universe expands, objects at larger distances move faster, and the light from them shifts out of the visible part of the electromagnetic spectrumO Both a) and b)O Neither a) nor b)

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Answered: What curvature will the universe have…

What curvature will the universe have if the matter and energy density of the universe is equal to the critical density? Open Closed Flat None of the above

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter29: The Big Bang

Section: Chapter Questions

Problem 30E: It is possible to derive the age of the universe given the value of the Hubble constant and the...

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Concept explainers

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.

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