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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
Who lights the stars in the sky when they blow out?
Stars are not literal flames that can be "blown out." Stars create light through nuclear fusion in their core, so they do not need to be relit like a candle. Once a star exhausts its fuel and reaches the end of its life cycle, it may undergo changes such as becoming a white dwarf, neutron star, or even a black hole.
How are multiple galaxies are organized?
Galaxies come in a number of forms and are very distant being that our own galaxy is 100,000 light years across, meaning traveling at the speed of light it takes one hundred thousand years to traverse [travel across], and then between our galaxy and others there are hundreds of thousands of light years. Generally, like stars, we use light wavelengths to determine the makeup, distance and speed of galaxies, whereas for the way they look we use varying wavelengths of energy, gamma rays, x-rays, infrared, ultraviolet and so on to get varying appearances of the distant objects and hopefully get a good idea of what they look like.
Gravity is the force responsible for the formation of the solar system, the movement of objects within the solar system, and holding together stars and galaxies. It is a fundamental force of nature that acts over large distances and is essential for understanding the structure of the universe.
What is the black-hole in the galaxy?
Almost every galaxy has a super massive black hole in its centre and this fact is widely accepted now days . Milky way galaxy also have a super massive black hole of its own, weighing more than 4 million times more than our sun's mass.
Andromeda galaxy is our nearest neighbour having a super massive black hole in its centre weighing 114 million solar masses .
Does the supermassive blackhole at the center of your galaxy contain most of the mass of the galaxy?
No. The super massive black hole at the center of the galaxy has about 4 million times the mass of the sun while the galaxy as a whole has at leas 1 trillion solar masses. In other words the black hole at the center of the galaxy accounts for about one twenty-fifth of one percent of the galaxy's mass.
What is an easy way to study the formation of the solar system?
One easy way to study the formation of the solar system is to read books or watch documentaries that explain the process in a simplified manner. Online resources, such as NASA's website, also provide detailed information and visualizations to help understand the formation of the solar system. Additionally, visiting museums or planetariums that have exhibits about the solar system can offer a hands-on learning experience.
What galaxy has arms where lots of new stars are being born?
The Milky Way galaxy has spiral arms where a lot of new stars are being born, including the Orion Arm where our solar system is located. These spiral arms are regions of higher density that promote the formation of new stars due to gravitational interactions between gas and dust.
There is actually quite strong evidence for such a black hole - both from x-ray observations, and by observing the movement of nearby stars. The movements of nearby stars indicate that they are orbiting an object with about 4 million solar masses, and since this mass is concentrated in a very small space (the apoapsis of some of those stars is fairly close to the object), the only reasonable explanation, according to current astronomical knowledge, is a black hole.
What is the difference between disk stars and halo stars?
- Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have more randomly oriented orbits.
- Clusters of young stars are found only in the disk.
- Disk stars come in a broad range of masses and colors, while halo stars are mostly of low mass and red.
- Gas and dust are abundant in the disk but not in the halo.
What did the Herschels find when they counted stars in 683 regions around the Milky Way?
The numbers of stars and their distances depended to some extent on their direction.
This helped William Herschel to work out a model for the shape or the Milky Way
Galaxy.
In fact the shape he described is not too far from our modern ideas. Unfortunately he was limited by the knowledge and technology of his time. He decided, wrongly, that the Sun must be near the centre of the Galaxy.
How far away is the black hole in the centre of your galaxy?
The black hole at the center of our galaxy, the Milky Way, is about 26,000 light-years away from Earth. It is known as Sagittarius A* and has a mass equivalent to about 4 million times that of our sun.
What lies in the center of your galaxy?
It is likely to be a black hole though this has yet to be confirmed.
Is it true that the further galaxies are away from us the faster they move?
Yes, it is true. This relationship is described by Hubble's law, which states that the velocity at which a galaxy moves away from us is directly proportional to its distance from us. This observation is a key piece of evidence supporting the expanding universe theory.
What is the distance to the center of the milky way?
The distance from Earth to the center of the Milky Way is approximately 25,000 light-years.
Can you download Mega Jump on a Samsung Galaxy player?
Unfortunately, Mega Jump is not available for download on the Samsung Galaxy Player as it is an older device and may not be supported by the game's current software requirements. You may want to check the Google Play Store to see if there are any alternative games similar to Mega Jump that are compatible with your device.
A1. Astronomers estimate there may be at least 10^11 Galaxies in the Universe, and each Galaxy may have between 10^7 to 10^14 Stars. Say an average of 10^10. Some of which will have solar systems.
[For convenient typing, I use the caret mark ^instead of using the superscript.]
In addition, current thinking is that about 90% of the universe is Dark Matter, about which we know almost nothing. But that would only add a couple of decades (10^2) to the above numbers.
[On a point of Grammar, we may not know how many unknown objects there are.]
How are super-massive black-holes in the center of galaxies?
millions of black holes are in all of the galaxies, and in the center of all large galaxies is an enormous black hole that makes all the stars go around it. the power was a million times greater 350 years ago. this cycle will repeat over again.
Scientists have come to believe that there is very probably a supermassive black hole in the center of the Milky Way, and that there may be supermassive black holes at the centers of many galaxies.
Which characteristics is used to classify galaxies?
In almost every case, whether it is an instrument actually on the planet, or a telescope looking up from the earth, scientists use some variation of an instrument called a spectrometer. Spectrometers take a signal from whatever they are looking at (whether it is a rock, or a cloud or a whole planet or a star or a galaxy or a nebula, etc.) and spread the signal out into its components. Most spectrometers work with light and are a lot like extremely good prisms; they take the light coming from some object and separate it out into its colors. This is useful because it turns out that every element on the periodic table only gives off light of a few certain colors.
See related question(s) below.
What is a small galaxy in a solar system?
The term "galaxy" typically refers to a large system of stars, gas, and dust, while a "solar system" refers specifically to our own system, with the Sun and its planets. There are no small galaxies within our solar system since galaxies are much larger in scale compared to solar systems.
Is a galaxy at the center of the solar system?
No, the center of our solar system is the Sun. A galaxy is a large system of stars, gas, dust, and dark matter held together by gravity, and contains billions of stars, such as the Milky Way galaxy where our solar system resides.
What have astronomers discovered by measuring small gravitational wobbles in stars?
Astronomers have discovered exoplanets orbiting stars by measuring the small gravitational wobbles in the motion of the stars. These wobbles indicate the presence of an orbiting planet pulling on the star with its gravity, causing it to move slightly. This method, known as the radial velocity technique, has been crucial in detecting numerous exoplanets outside our solar system.
Why is Earth such an important part of your solar system?
Earth is important because it is the only known planet with conditions suitable for supporting life. Its atmosphere, moderate temperature, and presence of water allow for the diverse ecosystems and habitats that sustain life as we know it. Additionally, Earth's position in the solar system has influenced the development and evolution of life on our planet.
What is a sentence for irregular galaxy?
An irregular galaxy is a galaxy with no definite shape like spirals, lenticulars, and ellipticals.
What has the sun located at its approximate center?
The core of the Sun is considered to extend from the center to about 0.2 to 0.25 solar radius. It is the hottest part of the Sun and of the Solar System. It has a density of up to 150,000 kg/m³ (150 times the density of liquid water) and a temperature of close to 15,000,000 kelvin (by contrast, the surface of the Sun is close to 6,000 kelvin). The core is made of hot, dense gas in the plasmic state. The core, inside 0.24 solar radius, generates 99% of the fusion power of the Sun.
