Spiral galaxy

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disc containing stars, gas and dust, and a central concentration of stars known as the bulge.(Sloan) Spiral galaxies resemble spiraling pinwheels, nearly 77% of space consists of spiral galaxies. Though the stars and other visible material contained in such a galaxy lie mostly on a plane, the majority of mass in spiral galaxies exists in a roughly spherical halo of dark matter that extends beyond the visible component, as demonstrated by the universal rotation curve concept. In the Hubble classification scheme: Spiral galaxies…

contain? The Milky Way is a barred spiral galaxy, which looks like a pinwheel. At times, people can look up to the sky and see the faint band of light, the glow of stars in the galaxy’s disk, which gave the Milky Way its name. The galaxy is of an average size, 100,000 light-years across and 1,000 light-years deep. It contains about 500 billion stars and many planets. The center of the galaxy contains a supermassive black hole, which is the cause of our galaxies spiral space. Within the galaxy,…

The universe is filled with a vast amount of galaxies of various shapes and sizes. A galaxy is defined as a system of millions or billions of stars with gas and dust held together by gravitational attraction. There are several types of galaxy types: elliptical, spiral and irregular. Spiral galaxies are galaxies which usually have a large mass in the middle with arms branching off of it containing stars and star systems (Swinburne University of Technology, n.d.). All of the objects orbiting the…

finding new galaxies, planets asteroids, and more. But today, that's not what we are going to talk about. We’re going to talk about galaxies. Have you ever wondered what a galaxy really is? In the early 1900s, astronomers . Astronomers argued about spiral shaped, gas, dust were getting closer to discovering galaxiessome star vast cloud found in the night sky. In 1919, Edwin Hubble, an astronomer found the answers. Hubble used his 100-inch mirror and stood on top of Mount Wilson in California. He…

Cepheid Variable Stars are large and luminous yellow stars in space known to sporadically change size and temperature resulting in pulsing variations in brightness and thus, inconsistent levels of luminosity. There are two types of Cepheid Variable Stars; Type 1 Cepheids (or classical) which are high mass stars with smaller pulsating periods and Type 2 Cepheids which are lower mass stars with greater pulsation periods. All Cepheid Variable Stars, named after the first observed star of this type,…

out to me was Edwin Hubble. It is because of Edwin, we now have a better understanding on the distance in the universe and that it’s expanding. His research was very remarkable that he had a telescope with his name. Since Edwin established the scale of the universe and laid the observational basis, he helped us understand what are galaxies like in the universe. To start off, Edwin noticed a Cepheid variable in the Andromeda Nebula which is known to astronomers as M31. For Edwin to obtain his…

hundred billion galaxies in the observable universe. The first galaxies formed around 13.5 billion years ago after the big bang and the dark ages. NASA states that, “After the Big Bang, the Universe was composed of radiation and subatomic particles.” There are two theories about what happened next. The first theory is that small particles slowly team up and gradually form stars, star clusters, and eventually galaxies. The second theory states that the universe first organize as immense clumps…

and for the examples I will list below, you can see why in most cases, there’s nothing to fear on Earths end. Normal sized galaxies; such as the Milky Way galaxy, can contain an estimated 400 billion stars. In someone’s mind who knows nothing about Astronomy, they think that the larger the amount of stars, the more crowded the galaxy is. The truth is, that stars and planets are so far apart, the chances of them colliding with each other are small. That…

I would like to gain knowledge regarding galaxies, black holes, and exoplanets. A galaxy is a system that contains millions of stars, gas and dust held together by gravitational attraction. A black hole is a place in space where the gravitational force is immense, making the escape of matter and radiation impossible. An exoplanet is a planet that orbits a star, other than the sun, beyond our solar system. By choosing these targets, I wish to learn about how the first galaxies were formed, why…

messier galaxy is galaxy that is seventeen million light years away. This galaxy can be seen in the constellation Hydra. This galaxy is a spiral pinwheel galaxy and is also one of the brightest galaxies in the sky. The galaxy messier 83 was founded in February 23 in 1752 by Nicolas Louis de Lacaille. Lacaille found the Messier 83 galaxy off of the Cape of Good Hope. In March of 1781 Charles Messier added this galaxy to his catalog of nebulas objects, known as the messier catalog. Later on June…