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When did the Cosmic microwave background began to stream across the universe?
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∙ 6y ago
on the Era of Nuclei
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∙ 6y ago
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Why do astronomers use frequencies when investigating the universe?
It is because stars and other cosmic objects, radiate energy across the whole of the electromagnetic spectrum.
What are 3 sources of proof for the Big Bang Theory?
1. Redshift of GalaxiesThe redshift of distant galaxies means that the Universe is probably expanding. If we then go back far enough in time, everything must have been squashed together into a tiny dot. The rapid eruption from this tiny dot was the Big Bang.2. Microwave BackgroundVery early in its history, the whole Universe was very hot. As it expanded, this heat left behind a "glow" that fills the entire Universe. The Big Bang theory not only predicts that this glow should exist, but that it should be visible as microwaves - part of the Electromagnetic Spectrum.This is the Cosmic Microwave Background which has been accurately measured by orbiting detectors, and is very good evidence that the Big Bang theory is correct.3. Mixture of ElementsAs the Universe expanded and cooled down, some of the elements that we see today were created. The Big Bang theory predicts how much of each element should have been made in the early universe, and what we see in very distant galaxies and old stars is just right.You cannot look in new stars, like the Sun, for this evidence, because they contain elements that were created in previous generations of stars. As such, the composition of new stars will be very different from the composition of stars that existed 7 billion years ago, shortly after the Big Bang.4. Looking back in timeThe main alternative to the Big Bang theory of the Universe is called the Steady State theory. In this theory, the Universe does not change very much with time.Remember that because light takes a long time to travel across the Universe, when we look at very distant galaxies, we are also looking back in time.From this we can see that galaxies a long time ago were quite different from those today, showing that the Universe has changed. This fits better with the Big Bang theory than the Steady State theory.
What is the star Lucy?
BPM 37093 or loving known as Lucy is a variable white dwarf star in the constellation Centaurus.It is basically a cosmic diamond - a chunk of crystallised carbon, 4,000 km across.
Why do pulsars appear to flash on and off?
Because they spin. The radiation is directional and sweeps across the universe. A relatively stationary observer sees the pulsar as an off/on phenomenon.
If flying at light speed for an Eon is it possible to go beyond the universe?
The universe is about 90 billion light years across. An eon is about 550 million years. Flying at the speed of light for 550 million years you would travel 550 million light years, less than 1% of the distance across the known universe. So, probably not. It would make no difference how long you travel at light speed. If you travel for a billion trillion eons, you would still not pass through the boundries of the universe. For one thing, you would have a serious problem timing your journey, since for you a trip of any length would seem instantaneous.
Do we live in a geocentric or heliocentric solar system?
an interesting question. it's not clear the universe has an actual centre that you can point to. It's unlikely to be the Earth, which is orbiting around the much heavier sun. Which in turn is orbiting about the centre of the Milky Way. But centrism is a way of thinking about things in the most helpful way. A geocentric universe is a useful way of thinking to plan a car or airplane trip, not so great for planning a space probe to Saturn.no
Why do astronomers use frequencies when investigating the universe?
It is because stars and other cosmic objects, radiate energy across the whole of the electromagnetic spectrum.
What is energy that travels across distance in the form of EM waves?
"EM" stands for "electromagnetic" waves, a broad description that includes radio, microwave, heat, light, gamma rays and cosmic rays.
What is across the universe rated?
The film Across The Universe is rated PG-13
When was Across the Universe created?
Across the Universe was created on 1969-12-12.
What is the duration of Across the Universe film?
The duration of Across the Universe - film - is 2.22 hours.
When was Across the Universe - film - created?
Across the Universe - film - was created on 2007-10-12.
How much money did Across the Universe gross domestically?
Across the Universe grossed $24,343,673 in the domestic market.
What LP is across the universe on?
Across the Universe is on The Beatles last released album 'Let it Be' released in 1970.
What beatles song starts with across?
Across The Universe
When was Across the Universe - Holly Johnson song - created?
Across the Universe - Holly Johnson song - was created in 1991.
How much money did Across the Universe gross worldwide?
Across the Universe grossed $29,367,143 worldwide.
