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Cosmology

Cosmology is the area of physics that studies the universe in and of itself. Through the use of incredible and ingenious methods of experimentation, cosmologists attempt to discover how the universe began, how it is developing, and how or if it will end. Questions regarding the Big Bang, dark matter, dark energy, the cosmic background radiation, and the initial formation of the fundamental particles can be placed into this category.

776 Questions

How many universes are living in ours?

It seems like your question might be a bit unclear. If you're asking:

"How many universes are we living in?"

The answer from current science is: one.

We live in one known universe—the observable universe that includes all known matter, space, time, and energy. However, in theoretical physics and cosmology, there's a concept called the multiverse, which suggests there might be multiple or even infinite universes outside our own, each possibly with different physical laws.

These ideas come from:

String theory

Cosmic inflation models

Quantum mechanics (Many-Worlds Interpretation)

But to be clear:

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👉 There is no experimental proof yet that other universes exist. It remains a theoretical concept.

How is cosmic background radiation related to the big bang?

Cosmic Background Radiation, also known as the **Cosmic Microwave Background (CMB)**, is directly related to the Big Bang as the afterglow of the universe’s formation. Here's how they are connected:

1. **The Big Bang Theory**

  • The Big Bang theory suggests that the universe began about **13.8 billion years ago** from a hot, dense state and has been expanding ever since. In the early moments of the universe, it was extremely hot and filled with high-energy radiation.

2. **Cooling of the Universe**

  • As the universe expanded, it cooled. About **380,000 years after the Big Bang**, the universe had cooled enough for protons and electrons to combine and form neutral hydrogen atoms in a process known as *recombination*. Before this, the universe was opaque because photons (light particles) scattered off free electrons. Once neutral atoms formed, the universe became transparent, allowing light to travel freely.

3. **Cosmic Microwave Background (CMB)**

  • The light that was released at the moment the universe became transparent is what we now observe as the CMB. Initially, this radiation was very energetic, but as the universe expanded, the wavelength of this light stretched into the microwave part of the electromagnetic spectrum, lowering its energy and temperature.

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What makes science so important?

Science is important because it helps us understand the world around us, make informed decisions, and solve complex problems. It also drives innovation and technological advancements that improve our quality of life. Additionally, scientific research contributes to our understanding of natural phenomena and the universe.

What is the personal cosmology in which objects are considered to be alive?

Personal cosmology that considers objects to be alive is often grounded in animism, a belief system that attributes a spiritual essence or life force to all things, including inanimate objects. This belief suggests that everything in the world, from rocks to trees to artifacts, possesses a soul or consciousness. Animism is found in various indigenous cultures and philosophies worldwide.

Where to study theoretical physics?

Since I LOVE physics, astronomy, genes, chemistry, and science in general. I especially like quantum physics. However, I'm just 12 years old and I go to this separate school every Saturday and ask my Algebra 2 teacher about quantum physics since she is a high school. I ask her about the M-theory, wave-functions, super-string theory, gravitons, and others. Sometimes she clears things up for me. Apart from that, I read, read, and read. Read. I took physics class for my age at this one summer thing and is was SO SO SO BORING. The stuff I'm reading is college level quantum physics, so unless you are college age i suggest you read, read, and read some more. Hope this helps.

Since gravity cannot be seen is it Dark Matter?

If you suspect that something invisible may actually be dark matter,

then you should also be considering

-- sound

-- microwaves

-- heat

-- honesty

-- weight

-- faith

-- electric current

-- courage

.

.

etc.

In short: No, gravity is not dark matter. It's not matter of any kind. It's one of

the four fundamental forces in the universe. Gravitons, the hypothetical gauge

particles of gravity, might be dark matter except that one of the things we know

about them is that if they exist, they're massless.

What are some primary contributors to background radiation?

Radiation is a natural part of the universe. It comes from cosmic rays, the big bang, stars, rocks, soil, and gasses. Even BANANAS are radioactive. Google "radioactive bananas" for a real treat!

How do you find the secret to the universe?

Assuming there is a "secret" to find, the most consistent way of reaching for it is a highly iterative process - observe the universe around us, formulate hypotheses, make predictions of behaviors, experiment where possible, observe results of experiments, and finally compare the outcome of the experiment with the predictions. Every time an outcome of an experiment matches the prediction, we can be said to have taken one step closer to finding "the secret". The problem is that nobody knows how many steps it'll take to get there.

How many g on BPM 37093?

BPM 37093, also known as V886 Centauri, is a white star of approximately 1.1 solar masses some 50 light years from earth. The estimated surface gravity is, in cgs, about 645,654,229 cm/s2, or roughly 658,000 times larger than the gravity at the surface of the earth - most decidedly an inhospitable place.

How fast could an ion drive accelerate a ship?

An ion drive provides extremely low acceleration, but it can be sustained for a very long period of time. There are a couple of different types of ion thrust engines producing thrusts from under 100 mN up to a few thousand mN. Compare this to the Space Shuttle which, combining the main engines and the solid rocket boosters (SRBs), produces 30 MN.

What do you call a rip in space time?

It is not an established fact that space time has any rips in it, but the term wormhole has been used by physicists to describe a possible hole in the normal space time geometry, caused by an extreme gravitational field.

What the unverse is made of?

The universe is primarily made up of dark matter, dark energy, and normal matter. Normal matter includes atoms and particles like protons, neutrons, and electrons that make up stars, planets, and the things we see around us. Dark matter and dark energy are mysterious components that scientists are still trying to understand.

Were there gamma rays in the singularity that gave rise to the big bang?

Yes, it is believed that gamma rays were present during the early stages of the Big Bang, produced as a result of high-energy processes. However, the extreme conditions of the early universe make it impossible to directly observe these gamma rays.

Why roti bread is round?

Roti bread is traditionally round in shape to ensure even cooking on a flat griddle. The round shape allows the dough to be stretched and rolled out easily in a circular motion. Additionally, the round shape is practical for tearing and sharing the bread during meals.

What are three primary contributions to Astronomy?

  1. Observing and studying celestial objects and phenomena, such as stars, planets, and galaxies.
  2. Developing theories and models to explain the behavior and structure of the universe.
  3. Using technology, such as telescopes and satellites, to gather data and expand our understanding of space.

What are the seven realms of Anglo Saxon cosmology?

The seven realms of Anglo Saxon cosmology are Midgard (earth), Asgard (realm of the gods), Vanaheim (realm of the vanir gods), Jotunheim (realm of the giants), Alfheim (realm of the light elves), Svartalfheim (realm of the dark elves), and Helheim (realm of the dead). Each realm had its own significance and inhabitants in Anglo Saxon mythology.

What is beneficial of physical science?

One very minor benefit of the study of physical science is that it engenders new technologies like home computers, the internet, Wikianswers and maybe we may also be able to feed everyone on the planet.

Personally i feel we should study the sciences because we can.

As the only species on the planet that can use reason it is probably our duty to use our reason to the max.

Why were there particle's before the big bang?

Nobody knows for certain what happened before the Big Bang exploded, or why it exploded when it did explode. Astronomers have determined much of what happened back to the Big Bang, but, Nobody knows anything, about what happened before the massive explosion that started the universe we live in now, and for the last billions of years. There are countless unanswered questions about the pre Big Bang universe that might never be answered.

What color is the big bang?

The colour of the big bang is impossible to tell. The singularity (a point of infinite density) before the big bang actually happened would have so much mass that not even light could escape, similar to a black hole. So right as it happened, which was expanding faster than the speed of light, it's density would still be enormous enough for a moment to not allow light to escape, but then once it did allow light to escape, all the light that it did not allow and "sucked" in would suddenly escape and with all that light it would be impossibly bright, and would seem white. And not until much later would you be able to see the colour and it would be many different colours depending on where you are looking (assuming that your retina's were extremely tough and didn't vaporize with the ridiculously brightness of the big bang)

Which theory of the universe did the 1964 discovery of cosmic microwave background radiation support?

The 1964 discovery of cosmic microwave background radiation supported the Big Bang theory of the universe. This radiation is considered a remnant of the early stages of the universe when it was hot and dense, aligning with the predictions of the Big Bang model.

What did scientists predict the big bang should have left behind?

Scientists predicted that the Big Bang should have left behind a faint glow of radiation spread throughout the universe, known as the cosmic microwave background radiation. This radiation was discovered in 1965 and is considered one of the strongest pieces of evidence in support of the Big Bang theory.

Did all iron on earth originate from the big bang?

No. The only elements made within a few million years (actually a few seconds) after the Big Bang were hydrogen, helium, and trace amounts of lithium. Iron was not created until stars began nucleosynthesis.

How fast do you have to travel to catch fire?

It is not possible to catch fire due to speed alone. However, if an object is traveling at extremely high speeds in Earth's atmosphere, the friction with the air could generate enough heat to cause it to catch fire. The specific speed needed would depend on various factors such as the object's shape and materials.

How do astronomers determine the speed at which a galaxy is moving?

By examining its spectrum, and identifying absorption lines in it.

Lines are shifted toward shorter wavelength if the object is moving towards us.

They're shifted toward longer wavelength if the object is moving away from us.

Is it true studies provide evidence that there is a great amount of unseen matter called dark matter composed of dim stellar remnants that have no mass?

Studies have not shown dark matter to be composed of dim stellar remnants. Dark matter is thought to be made up of a non-baryonic, non-luminous material that does not interact with electromagnetic forces. Its presence is inferred from its gravitational effects on visible matter in the universe, and its exact nature remains unknown.