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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

Why would a linear accelerator have no effect on a neutron?

A linear accelerator works by having a magnet at the end of the accelerator. If the particle is neutral then it will not be attracted to the magnet and therefore nothing will happen, as in the case of a neutron.

What are facts about the cosmological argument?

The cosmological argument is a type of argument for the existence of God based on the idea that the universe must have a cause that originated it. It asserts that everything that begins to exist must have a cause, and since the universe began to exist, it must also have a cause. This argument has been debated for centuries by philosophers and theologians.

Are neutrons 2000 times more massive than a electron?

Neutrons are 1836.128973 times more massive than an electron, which can be rounded up to 2000 if it so pleases you.

What is the area of invisible space around us called?

It is called dark matter. Dark matter is undetectable and invisible.

What happend to lone neutrons?

A neutron has a lifetime of about 15 minutes. This means that if you wait roughly 15 minutes there is a good chance the neutron will have decayed into other particles. So lone neutron just decay quickly, that is why there aren't any around.

A neutron in an atomic nucleus is stable however (fortunately for us!).

Why can't the dark matter in galaxies be made of neutrinos?

Dark matter MIGHT be made of neutrinos. Problem is, we can't be certain because of two gaps in our knowledge:

1) how much mass is in one neutrino? We have an upper limit for its mass (about 1 eV) and we have a lower limit for its mass (about 0.04 eV); but we don't know any better than that.

2) how many neutrinos are out there? We can make a general estimate of how many neutrinos existed near the start of the Big Bang, but even this has some variation. Then we must ask what percentage of neutrinos have decayed in the last 13.7 billion years. Again, we know that neutrinos decay, but we don't have a good idea of how often they do so.

As we get a better idea of the answer to (1) and (2), we might be able to either conclude that neutrinos account for almost all of the dark matter, or that they account for very little. Until then, we're just multiplying a speculative number times a speculative number times a speculative number.

Is there a loophole in big bang theory?

It is important to first realize that the big bang theory is a theory; it is not a physical law on its own for which there might be loopholes.

However, I think (correct me if I am wrong though), that you are referring to the idea that the big bang theory states that the Universe started with a bang which just came into being out of nothing.

This is not entirely correct, the big bang theory does not implicitly say that the Universe came into being at some point; it only says that in the distant past the Universe was very small and that it has been expanding ever since. This statement is well verified by observations and measurements. It does not claim or explain how the Universe came into being.

It might sound reasonable that the Universe somehow came into being as a point, and it would fit with the above statements, but the creation of the Universe itself is not yet something that science can say much about. There are models, such as string theory, that sometimes have things to say about this, but they are far from testable at this stage.

So, yes, it is possible that something else happened before the Universe became tiny and started to expand, and it wouldn't contradict with the big bang theory at all.

Is the sun dark matter?

No, the sun is not dark matter. Dark matter is a mysterious form of matter that does not emit, absorb, or reflect light. The sun, on the other hand, is a star that emits light and heat due to nuclear reactions happening at its core.

Does conservation of angular momentum disprove the big bang?

No,

This assumes that the universe is a closed system, while this seems a reasonable hypothesis, the modern big bang theory actually states outright that the universe is not a closed system. Conservation of energy is also violated in the current model, the total energy of the universe is increasing.

What branch of physics studies the universe as a whole?

Physics is a diverse area of study and in order to make sense of it scientists have been forced to focus their attention on one or two smaller areas of the discipline. This allows them to become experts in that narrow field, without getting bogged down in the sheer volume of knowledge that exists regarding the natural world.

  • Astronomy - the study of space
  • Astrophysics - the study of the physical properties of objects in space
Cosmology & Astrophysics

If you have an interest in the physical properties of space, this is the place for you. Cosmology & astrophysics are sub-fields of astronomy, focusing on the properties of the universe as a whole (cosmology) and the physical or chemical properties of celestial bodies (astrophysics).

Is dark matter considered to be the conciousness of GOD?

No. Dark Matter is the cause of a number of galaxies and galaxy clusters apparently having far more mass than they should. Scientists still do not know what dark matter is. It appears to interact with the rest of the universe only through gravity; there is nothing to indicate it has anything to do with consciousness. The idea dark matter relating to consciousness likely comes from Phillip Pullman's fantasy book series His Dark Materials in which dark matter is the stuff of consciousness.

Is the Universe like water?

Not especially, no. In fact, it's so little like water that I can't even begin to imagine why you would think it might possibly be like water.

Transition A produces light with a wavelength of 400 nm Transition B involves twice as much energy as A What wavelenth light does it produce?

Transition B produces light with half the wavelength of Transition A, so the wavelength is 200 nm. This is due to the inverse relationship between energy and wavelength in the electromagnetic spectrum.

What force do scientists thinck was responsible for clumping matter together to form the first stars after the big bang?

Scientists believe that gravity was responsible for clumping matter together to form the first stars after the Big Bang. Gravity caused the dense regions of matter to attract more matter, which eventually led to the formation of the first stars.

How did they find the size of the universe?

At present, the size of our Universe is unknown. Because light can travel no more than about 300,000 kilometers per second, and because light has only been traveling to us since the time of recombination; there is a limit on how much of our Universe we can see. How much larger is our Universe, beyond what we can presently see, is a matter of speculation.

What if you add one electron to the element having 9 protons and 10 neutrons?

By adding one electron to an element with 9 protons and 10 neutrons, you would create a negatively charged ion. The electron would occupy an orbital in the electron cloud, resulting in the element being one electron short of achieving a stable electron configuration. This ion would have a charge of -1 due to the extra electron.

What is the most likely explanation for the start of the universe?

The most widely accepted explanation for the start of the universe is the Big Bang theory. This theory suggests that the universe began as a singularity that rapidly expanded about 13.8 billion years ago, creating everything we see today.

What episode and season of Jimmy Neutron have pants attack?

Episode 1 : "When Pants Attack" , was in the first season and aired July 20, 2002 .

When will aliens contact Earth?

you should read up on the alien thing, although i believe they may be out there, we do not know that they are, so we can safely say probably never, at least for now...

=========================================

An innocent passerby stopped to remark:

I like that: " ... never, at least for now ... "

When you try to grab it and inspect it a little more closely,

it makes about as much sense as:

"This statement is false."

What episode is April the gorlock on jimmy neutron?

April the gorlock appears in the episode titled "Monster Hunt" in the animated series "Jimmy Neutron: Boy Genius." She is a fearsome creature that Jimmy and his friends encounter while on a camping trip.

What was Galileo's contribution to the Big Bang Theory?

Galileo did not contribute to the Big Bang Theory directly as his work focused on astronomy, not cosmology. The Big Bang Theory was developed in the 20th century based on evidence from observations of the universe's expansion. Galileo's contributions to astronomy include improving the telescope and making important astronomical observations, such as the phases of Venus and the moons of Jupiter.

How well is the big bang theory accepted by the scientific community?

The Big Bang Theory is very well accepted by the scientific community; it is considered to be solidly supported, and it is regarded as the best theory that we presently have, to explain the origin of the universe as we know it.

What particles came together to form protons and neutrons?

Quarks.

They come in a total of 6 varieties called (flavours). Up, down, strange, charm, bottom and top which are figurative names describing various properties.

Different combinations of quarks make up Neutrons and protons and other less stable particles.

To find out details please look up quantum chromodynamics. The term quark was applied by Murray Gell-Mann.

When did the majority of people start to believe in a heliocentric galexy?

This explains the input of several astronomers into this theory. Copernicus: In 1418-30, he did his work on 'On the Revolutions of Celestial Spheres' In this book, he suggested that Earth rotated daily on its axis and that it orbits the Sun every year. He also said that other planets also rotated around the Sun, and that the Earth wobbled slightly as it span on its orbit. His theory, did not disagree completely with the older ideas; he still said that there were solid planet bearing spheres and that the outermost sphere contained the stars. He also explained that the Earth was not at the centre of the Universe. This caused uproar in the Catholic Church, because it disagreed with the God's Perfect Creation theory. Galileo: Galileo first studied the moon. He discovered that the moon was not smooth, but heavily cratered. He went on to discover, four satellites (moons) orbiting Jupiter. After this, he then discovered Saturn's rings, but he did not know what they were. These discoveries, made it very difficult to defend the perfect universe theory, with perfect smooth bodies of all the objects. He then noticed that Venus went through phases like the moon (ie: full, half, new etc.). This proved that Venus could not be orbiting the Earth, but had to be orbiting the Sun. After Copernicus' and Galileo's theories, the Inquisition of Rome was formed saying that after looking into the theories, they were absurd. They said that they were heretical. Eventually, Galileo was charged by the Inquisition, and was put under house arrest. Kepler: In 1592, Kepler became an apprentice to Brahe, a man who owned the largest collection of astronomical instruments in the world. When Brahe died, Kepler inherited them all. He immediately sent Galileo a message of encouragement, and then looked at a calculation that Galileo had sent him. Using Brahe's charts, Kepler was able to show that planets had elliptical orbits, and that this usually was the case. However, he soon died in poverty, as Protestant beliefs disagreed with his findings.