what is the relationship between stars and galaxies? | Yahoo Answers
To distinguish galaxies from stars, you can use the spectrum. Roughly, stars have a black-body like spectrum with features depending on the. They are progressively inclusive from the smallest to the largest. Chances are that a large percentage of the stars in the galaxy also have planets orbiting them, which would make them suns as well.
Although astronomy is a complex science, these basic terms can be understood by virtually anyone. In fact, a basic understanding of these astronomical systems is generally required in science class at some point during grade school.
Solar System Solar systems are the smallest of the three systems in question. A solar system consists of a star, such as the sun, and the objects affected by its gravity.
These objects include planets, moons, asteroids, comets and meteoroids. Although solar systems are smaller than either the universe or a galaxy, the actual size of even the very smallest of solar system is difficult for the human mind to truly comprehend. In terms of scale, if the sun had the dimensions of a tennis ball, the Earth would be the size of a grain of sand located about 8 meters 26 feet away.
Star-Filled Galaxies A galaxy is a system of solar systems and other stars. Galaxies, like solar systems, are held together by gravity. In galaxies, the solar systems are separated by vast sections of mostly empty space. The galaxy that contains the Earth and its solar system is called the Milky Way. A galaxy is an enormous collection of gas, dust and billions of stars held together by gravity.
One galaxy can have hundreds of billions of stars and be as large aslight years across. What is the name of our galaxy? The name of our galaxy is the Milky Way. Our Sun and all of the stars that you see at night belong to the Milky Way.
When you go outside on a dark night and look up, you will see a milky, misty-looking band stretching across the sky. When you look at this band, you are looking into the densest parts of the Milky Way, the "disk" and the "bulge.
Our solar system is at the edge of a spiral arm called the Orion Arm, and is about two-thirds of the way from the center of our galaxy to the edge of the starlight. The Earth is the third planet from the sun in our solar system of nine planets. What is the closest galaxy like our own, and how far away is it? The closest spiral galaxy is Andromeda, a galaxy much like our own Milky Way.
Andromeda is approaching our galaxy at a rate ofmiles per hour 1, kph. Five billion years from now it will probably collide with our Milky Way galaxy. What are the parts of a galaxy? A galaxy contains stars, gas and dust. In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a "bulge," a "disk" containing "spiral arms," and a "halo.
Bulge The bulge is a round structure made primarily of old stars, gas, and dust. The outer parts of the bulge are difficult to distinguish from the halo. The bulge of the Milky Way is roughly 10, light years across.
Disk The disk is a flattened region that surrounds the bulge in a spiral galaxy. The disk is shaped like a pancake. The Milky Way's disk islight years across and 1, light years thick. It contains mostly young stars, gas and dust, which are concentrated in spiral arms.
Some old stars are also present. Spiral Arms The spiral arms are curved extensions that begin at the bulge of a spiral galaxy, giving it a "pinwheel" appearance. Spiral arms contain a lot of gas and dust as well as young blue stars. Spiral arms are found only in spiral galaxies. Halo The halo primarily contains individual old stars and clusters of old stars "globular clusters".
The halo also contains "dark matter," which is material that we cannot see but whose gravitational force can be measured. The Milky Way's halo may be overlight years across.
What is the relationship between the solar system, galaxy, and universe?
Stars, gas, and dust Stars come in a variety of types. Blue stars, which are very hot, tend to have shorter lifetimes than red stars, which are cooler.
Regions of galaxies where stars are currently forming are therefore bluer than regions where there has been no recent star formation. Spiral galaxies seem to have a lot of gas and dust, while elliptical galaxies have very little gas or dust. How are galaxies classified? Astronomer Edwin Hubble classified galaxies into four major types: Most of the nearby, bright galaxies are spirals, barred spirals or ellipticals. Spiral galaxies have a bulge at the center and a flattened disk containing spiral arms.
Spiral galaxies have a variety of shapes and are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap around the bulge, contain numerous young blue stars and lots of gas and dust.
Stars in the bulge tend to be older and redder. Yellow stars like our Sun are found throughout the disk of a spiral galaxy.
Relationship Between Solar Systems, Galaxies, and the Universe by Tara Bhargava on Prezi
The disks of spiral galaxies rotate somewhat like a hurricane or a whirlpool. Barred spiral galaxies are spiral galaxies that have a bar-shaped collection of stars running across the center of the galaxy.
Elliptical galaxies do not have a disk or arms. Instead, they are characterized by a smooth, oval-shaped appearance. Ellipticals contain old stars, and possess little gas or dust. They are classified by the shape of the ball, which can range from round to oval baseball-shaped to football-shaped. In contrast to the disks of spirals, the stars in ellipticals do not all revolve around the center in an organized way.