In principle, if we could see all the way to the cosmological horizon we could see the Big Bang taking place. However, our view is blocked for times before about 380,000 years after the Big Bang. Why?
A) Before that time, the universe was too crowded with stars.
B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely.
C) Before that time, the universe was dark so there was no light to illuminate anything.
D) 380,000 years after the Big Bang marks the time when stars were first born, producing the light by which we can see the universe.
B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely.
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The cosmological principle states that any observer in any galaxy will see the same general features of the Universe
a. True b. False Indicate whether the statement is true or false
A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?
A) 110 m/s2 B) 220 m/s2 C) 800 m/s2 D) 880 m/s2 E) need more information
Two light sources are said to be coherent if they are
A) of the same frequency. B) of the same frequency, and maintain a constant phase difference. C) of the same amplitude, and maintain a constant phase difference. D) of the same frequency and amplitude.
The most famous case of a more massive hot star orbiting with a more evolved but presently less massive red giant is the eclipsing binary:
A) Aldeberan. B) Antares. C) Algol. D) Alberio. E) Altair.