0
Galaxies
Galaxies are large systems of stars and interstellar matter, and they contain billions of stars. Our own galaxy, the Milky Way, has 200 to 400 billion stars, and there are over one billion known galaxies. Questions that have to do with galaxies in general and specific galaxies are perfect for this category!
2,392 Questions
Is your solar system bigger than other galaxies?
No. A galaxy requires more than one star in the first place and all currently known binary or multiple star systems are larger than our solar system, and galaxies are typically hundreds of millions times larger than any star system.
How many years to go to the star?
The Nearest star after our Sun is Alpha-Centuri. It is at a distance of 4 light years.
That is it takes light four years to reach the Earth. In term of miles it is ~ 3.6 x 10^(50) miles. or in numbers:
360.000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.0 miles.
Yes, there are maps of galaxies in the form of galaxy surveys conducted by astronomers. These surveys aim to chart the distribution of galaxies in the universe and understand their large-scale structure. The most well-known map of galaxies is the Sloan Digital Sky Survey (SDSS).
What is the effects of powerful jet to the nearby galaxy?
A powerful jet emitted by a black hole can have significant effects on a nearby galaxy. It can heat up the gas in the galaxy, disrupt star formation, trigger the formation of new stars, and even expel gas from the galaxy, influencing its evolution and morphology.
Andromeda Galaxy is 2.52±0.14 million light-years from Earth.
What is Earth's galaxy address?
Our galaxy is part of the Local Group which consists of more than 30 other galaxies.
But E.T. might send mail to: Earth, The Orion-Cygnus Arm, Local Spur, right off The Sagittarius Arm, Milky Way, about 25,000 light years (give or take 1,000) from center. It will take some time to arrive. See link for available postcard designs.
Ursa Major Orion and Andromeda are fixed groups of stars called?
Ursa Major, Orion, and Andromeda are fixed groups of stars called constellations. These groupings of stars have been recognized and named by various cultures throughout history, serving as visual markers in the night sky. Each constellation has its own unique patterns and mythology associated with it.
How did Edwin Hubble determine that the Great Galaxy in Andromeda is located beyond our galaxy?
That became clear once the telescopes were powerful enough to distinguish individual stars in the galaxies. Before that, they were seen only as "nebulae" (cloud-like objects), and it wasn't clear whether M31 (for example) was part of our own galaxy. M31 is also known as the Andromeda Galaxy.
Who showed that other galaxies existed?
The astronomer Edwin Hubble provided evidence in the 1920s that other galaxies existed beyond our own Milky Way. By observing Cepheid variable stars in the Andromeda Galaxy, he demonstrated that it was a separate galaxy located far outside our own. This discovery revolutionized our understanding of the universe's scale and confirmed the existence of other galaxies.
One planet orbiting a sun, might have a perfectly circular orbit. However, many planets orbiting a sun, in a galaxy, in a universe, influence and distort each others orbits. Add to this the influences of the rest of the universe, and circular orbits become elongated circles: ellipses.
Elliptical is used to describe an orbit or round shape that isn't perfectly circular - it's an ellipse, or oval.
The simple answer to this is, you can achieve very high velocity. The limiting factor is the speed at which what ever fuel is used is ejected from the rear of the spaceship. The speed of the spaceship's forward motion could only equal that of the fuels ejection at the rear. At this points the forces would be equal and acceleration would stop.
What constitutes a large galaxy as opposed to a small one?
you can send anything into space to find the edge
but it will eventually end up where it started
it is impossible to find the edge of the universe
only scientists can predict the size of the universe
There are more spiral galaxies than elliptical?
the elliptical galaxy has a round or oval shape the spiral galaxy has a hurricane shape
The origin of these different shapes would lie in the particular momentum of the constituent stars at the time they first coalesced into a galaxy under their mutual gravitational attraction.
What is most of the mass of a galaxy?
It is currently estimated that 73% of the mass in the Universe is a mysterious substance called dark energy, 23% is another mysterious substance called dark matter, and 4% is made up of "normal" matter (matter of known composition).
Answer2: the mass of the universe (2E53 kg) is normal matter including Plasma! Dark Energy" is the result of theoretical defects. Dark energy is the centrifugal vector energy mcV, associated with the the proper Quaternion Gravitational theory:
E = -mGM/r + mcV = - mu/r + mcV
The universe is composed of Quaternions, a scalar and three vector parts; a boson and a fermion part. Newton and Einstein's gravitational theories do not include the vector component mcV. Incorporating this proper quaternion energy the universe is seen to be in equilibrium and the redshift is the indicator of Continuity.
Equilibrium is
0 = (d/dr + Del)E
0 = (d/dr +Del)m(-u/r + cV) = m(u/r2 - cDel.V) + m(cdV/dr - Del u/r + cDelxV)
At Continuity, cos(RV) = v/c. At equilibrium v=c and GM/r = c2
The Quaternion universe is composed of normal matter and properly viewed has no need of "dark energy or dark matter (electric universe).
Which galaxy does the sun belong to?
These are the basics. Our sun is the star at the center of our solar system. A solar system is made up of a star and any other objects connected to it by its gravity. Our sun has the standard eight planets along with their moons, and also countless other objects including asteroids and comets. Our galaxy, The Milky Way, is estimated to contain between 200 billion and 400 billion stars. Some of those stars have planets orbiting them, and others do not. Our solar system then is just a very very tiny part of the Milky Way, and the Milky Way is one of billions of observable galaxies throughout space.
Why is it difficult to specify the dimensions of the disk and halo of the Milky Way?
Imagine that you were inside a large office building. Quick, what does it look like from the outside? That's basically why. While nearly all the individual stars we can see are in the Milky Way galaxy, we can only see a small fraction of them and being inside it, with dust clouds getting in the way (we can't even see, visually, the center of the galaxy, because of all the dust), it's kind of hard to tell what the overall shape is.
Now, to put things into perspective: when we say that we're "not certain" of the shape, what we really mean is fine detail. Just as if you were in the central courtyard of the Pentagon, you could be pretty sure that the building is pentagonal, the chances of the Milky Way NOT being a spiral galaxy are so close to zero as to be indistinguishable from it in any practical sense, and we're pretty sure it's a barred spiral. Exactly how many arms and how many times they wrap around ... that we can't really tell, but the gross structure is pretty nearly a dead lock.
How many galaxies are there in all?
Astronomers now estimate that the observable universe contains anywhere between 100 and 300 billion galaxies. However, if spacetime is flat on large scales (as it seems to be), the universe is infinite in size and contains an infinite number of galaxies in total - they are just so far away that there light has not had time to reach us since the beginning of the universe. In fact, because the universe is expanding, we will never see most of these galaxies ever!
billions
The answer to your question is unknown. The universe is infinite containing billions and billions of galaxies as it expands.
Why would a planetary nebula look like a ring to every observer in the galaxy?
A simple way to think of it would be if you lay a doughnut flat on a table and measure the thickness from the outside edge to the hole. Let's say it's 2 inches thick. Then measure the distance across the entire doughnut on the right and left edges without touching the hole. The amount of dough there may be 5 inches thick when seen edge on. The same principle works for a shell of gas. The shell of gas in a planetary nebula reflects more light from the edges because you are seeing more gas. The center seems hollow because you are looking through less gas. No matter where you look from, when you look right into the center you see less reflected light than around the edges so it looks like a ring.
What is the biggest star discovered so far?
The biggest star discovered so far is UY Scuti, a red supergiant located in the constellation Scutum. It has a radius more than 1,700 times that of the sun, making it one of the largest known stars in the universe.
If you know how far away it is, and the angle that it subtends, you can tell its size. For example, if something is 100 meters away and it fills 10 milliradians, it's 100 * 0.01 = 1 meter across. (A milliradian is 1/1000 of a radian, and a radian is about 57 degrees.)
The size in your telescope is easy, and it's a simple optical calculation to figure out how large an angle it actually takes up. That is, so long as it's something that appears as an object, not just a point. So the method will work with a galaxy, but not a black hole.
The only part with uncertainty is how far away it is. The red shift of the light can tell you that. Everything in the universe is moving apart, and the farther away something is the faster it is moving, so the greater the red shift. This method has been calibrated in a number of ways, in particular by observing certain types of variable stars. So that part of the method is pretty solid, too.
No, stars are not capitalized unless they are part of a specific name or title.
Summary of distance to Andromeda by gregorio brillantes?
pakshet, wla din akong makitang summary neto. puro about astronomy nilalabas ng google. Please answer: Why did Ben suddenly feel lonely, tiny and helpless while he was standing alone on the bridge?
"He stands alone on the bridge, and he is suddenly lonely, the vast humming turning within him, waiting: for a streak of blue flame, a signal flare among the stars. Where and why … Thousands of years away by the speed of light, the other worlds… He recalls the view of the heavens through the port holes of the rocket, and the photographs of the galaxies, the whirlpooled suns in the book his father gave him one Christmas. The rocket, an atom wandering in the outer reaches of unknown space: to be lost and lovely forever in the starry night… He feels very tiny, only a boy, shrinking, helpless, standing between the dark river and the lights in the sky."
