how fine tuned is the universe?
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Martin Rees formulates the fine-tuning of the universe in terms of the following six dimensionless physical constants. N, the ratio of the strength of electromagnetism to the strength of gravity for a pair of protons, is approximately 1036.
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Although the idea of a finite universe explains why Earth's sky is dark at night, other causes work to make it even darker. Not only is the universe finite in size, it is also finite in age. That is, it had a beginning, just as you and I did.
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Astronomy measures positions, luminosities, motions and other characteristics. Astrophysics creates physical theories of small to medium-size structures in the universe. Cosmology does this for the largest structures, and the universe as a whole.
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The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today. ... The universe began as a very hot, small, and dense superforce (the mix of the four fundamental forces), with no stars, atoms, form, or structure (called a "singularity").
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Which statements are true regarding the cosmological principle? T- The universe looks the same from all directions, but can change and evolve over time. The universe looks the same from all directions, and hasn't and won't change or evolve over time.
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Where is the centre of the universe? There is no centre of the universe! According to the standard theories of cosmology, the universe started with a "Big Bang" about 14 thousand million years ago and has been expanding ever since. Yet there is no centre to the expansion; it is the same everywhere.
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Scientists estimate there are 1080 atoms in the universe. Since we can't go out and count each particle, the number of atoms in the universe is an estimate. It is a calculated value and not just some random, made-up number.
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The CMB patterns do indeed change over time, although statistically they remain the same, and although it will not be noticeable on human timescales. ... So the question of how fast the CMB changes comes down to how much time did it take light to travel 19 kpc when the Universe was 379,000 years old.
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The Universe is 99.999% plasma “Today it is recognized that 99.999% of all observable matter in the universe is in the plasma state…” “It is estimated that as much as 99.9% of the universe is comprised of plasma.”
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Yes, indeed! Many nebulae are visible from Earth in a small and cheap telescope, and even to the naked eye (if you are standing in a sufficiently dark place).
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["1 What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of. ... ", '2 How did life begin? ... ', '3 Are we alone in the universe? ... ', '4 What makes us human? ... ', '5 What is consciousness? ... ', '6 Why do we dream? ... ', '7 Why is there stuff? ... ', '8 Are there other universes?']
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432 Hz. The magic number everybody is talking about. It is said to be the natural frequency of the universe, to have cosmic healing powers and to attract masses of audience to our music.
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Around 13.8 billion years ago, the universe was born in a colossal explosion known as the Big Bang. This produced two things: matter and energy. The universe formed in a tiny fraction of a second. At this point, it was very dense and incredibly hot.
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Type Ia supernovae are useful probes of the structure of the universe, since they all have the same luminosity. By measuring the apparent brightness of these objects, one also measures the expansion rate of the universe and that rate's variation with time.
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At this level, it is estimated that the there are between 1078 to 1082 atoms in the known, observable universe. In layman's terms, that works out to between ten quadrillion vigintillion and one-hundred thousand quadrillion vigintillion atoms.
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It turns out that roughly 68% of the universe is dark energy. Dark matter makes up about 27%. The rest - everything on Earth, everything ever observed with all of our instruments, all normal matter - adds up to less than 5% of the universe.
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The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).