Milky Way

Cosma Home > Communication > Knowledge > Realm > Physical > Universe > Galaxy > Milky Way

Spotlight



Note: This is a 360° Video — press and hold to explore it!

The latest star map from the Gaia spacecraft plots 1.7 billion stars (Lisa Grossman, Science News)

Related

Pages

Physical Realm
Universe Astronomical Instrument
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid

Posts

  • Milky Way Lost & Found (8/15/2018)- Have you seen the Milky Way? You may think that you have, but are you sure? Unless you live in an extremely remote area, or you’ve visited one, then you probably haven’t seen our own galaxy, the Milky Way, very well, or at all. Worse yet, you may not even realize that it’s missing. The … Continue reading Milky Way Lost & Found

Resources

These are organized by a classification scheme developed exclusively for Cosma. More…

General

Dictionary

Milky Way : the galaxy of which the sun and the solar system are a part and which contains the myriads of stars that create the light of the Milky Way — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Encyclopedia

Milky Way is the galaxy that contains our Solar System. The descriptor “milky” is derived from the galaxy’s appearance from Earth: a band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. From Earth, the Milky Way appears as a band because its disk-shaped structure is viewed from within. Galileo Galilei first resolved the band of light into individual stars with his telescope in 1610. Until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies.

The Milky Way is a barred spiral galaxy with a diameter between 150,000 and 200,000 light-years (ly). It is estimated to contain 100–400 billion stars. There are probably at least 100 billion planets in the Milky Way. The Solar System is located within the disk, 26,490 (± 100) light-years from the Galactic Center, on the inner edge of the Orion Arm, one of the spiral-shaped concentrations of gas and dust. The stars in the innermost 10,000 light-years form a bulge and one or more bars that radiate from the bulge. The galactic center is an intense radio source known as Sagittarius A*, likely a supermassive black hole of 4.100 (± 0.034) million solar masses.

Stars and gases at a wide range of distances from the Galactic Center orbit at approximately 220 kilometers per second. The constant rotation speed contradicts the laws of Keplerian dynamics and suggests that much of the mass of the Milky Way does not emit or absorb electromagnetic radiation. This mass has been termed “dark matter”. The rotational period is about 240 million years at the position of the Sun. The Milky Way as a whole is moving at a velocity of approximately 600 km per second with respect to extragalactic frames of reference. The oldest stars in the Milky Way are nearly as old as the Universe itself and thus probably formed shortly after the Dark Ages of the Big Bang.

The Milky Way has several satellite galaxies and is part of the Local Group of galaxies, which form part of the Virgo Supercluster, which is itself a component of the Laniakea Supercluster. — Wikipedia

Encyclopædia Britannica

Introduction


Search

WolframAlpha

Science


Note: This is a 360° Video — press and hold to explore it!

This 360-degree movie immerses viewers into a simulation of the center of our Galaxy. This visualization was enabled by data from Chandra and other telescopes and allows viewers to control their own exploration of this region. From the vantage point of the Milky Way’s supermassive black hole, Sgr A*, the viewer can see about 25 Wolf-Rayet stars (white, twinkling objects) as they continuously eject stellar winds (black to red to yellow color scale). These winds collide with each other, and then some of this material (yellow blobs) spirals towards Sgr A*. The movie shows two simulations, each of which start around 350 years in the past and span 500 years. The first simulation shows Sgr A* in a calm state, while the second contains a more violent Sgr A* that is expelling its own material, thereby turning off the accretion of clumped material (yellow blobs) that is so prominent in the first portion.



Our Galactic Core Has Thousands of Black Holes (Daniel Starkey, Geek.com)
New Study Suggests Tens of Thousands of Black Holes Exist in Milky Way’s Center (Jessica Guenzel, Columbia News)

Preservation

History


Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

Education

The Milky Way (Ask an Astronomer, Cornell University)
Milky Way (Cosmos4Kids)

Course



Crash Course Astronomy (YouTube)

OER Commons: Open Educational Resources

News

Phys.org, NPR Archives

Book

ISBNdb

Government

Document

USA.gov

Expression

Fun


returntotop

More…

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • A river of stars in the solar neighborhood
    on February 15, 2019 at 3:10 pm

    Astronomy & Astrophysics publishes the work of researchers from the University of Vienna, who have found a river of stars, a stellar stream in astronomical parlance, covering most of the southern sky. The stream is relatively nearby and contains at least 4000 stars that have been moving together in space since they formed, about 1 billion years ago. Due to its proximity to Earth, this stream is a perfect workbench on which to test the disruption of clusters, measure the gravitational field […]

  • Radio telescope gets upgrade at Brookhaven lab
    on February 15, 2019 at 1:50 pm

    A radio telescope at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory has received a significant upgrade, advancing from one dish to four. The upgrades are part of the Laboratory's ongoing effort to test the merits of a radio telescope for a potential future project between national labs and DOE-sponsored universities. The scientists' ultimate goal is to look deep into the universe and gain a better understanding of periods of accelerated expansion and the nature of dark […]

  • NASA selects new mission to explore origins of...
    on February 14, 2019 at 12:15 pm

    NASA has selected a new space mission that will help astronomers understand both how our universe evolved and how common are the ingredients for life in our galaxy's planetary systems. […]

  • Observations uncover details about the open...
    on February 13, 2019 at 2:10 pm

    Using the Vatican Advanced Technology Telescope (VATT) and data from ESA's Gaia satellite, astronomers have conducted a new study of the young open cluster IC 4996 and its vicinity. The research, presented in a paper published January 31 on arXiv.org, reports more details about properties of this cluster. […]

  • Multiwavelength observations of star-forming...
    on February 11, 2019 at 2:00 pm

    An international team of astronomers has conducted multiwavelength observations of the star-forming region G345.5+1.5. The observational campaign discovered dozens of massive stars as well as protostellar and bound starless clumps in the region. The study is presented in a paper published January 30 on arXiv.org. […]