Our Milky Way Galaxy: A Traveler's Guide (Infographic)

Our home in space is a vast galaxy containing 400 billion suns, at least that many planets, and a 4-billion-solar-mass black hole at the center.
Our home in space is a vast galaxy containing 400 billion suns, at least that many planets, and a 4-billion-solar-mass black hole at the center. (Image credit: Karl Tate, SPACE.com Contributor)

 

Our Milky Way is a barred spiral galaxy containing 400 billion stars bound together by gravity. From Earth, the galaxy has the appearance of a faintly luminous band in the sky.

The naked eye cannot resolve the individual stars making up the band, and it was not until the invention of the telescope in the 17th century that it was proved that the Milky Way galaxy contained multitudes of stars.

In the early decades of the 20th century, astronomer Edwin Hubble photographed other galaxies and determined that they too are huge systems of many stars, and not just small structures within our own galaxy. The Milky Way is but one among multitudes of galaxies in space.

The spiral structure of the Milky Way is obscured by the fact that our Earth, sun and nearby planets are embedded in the galaxy’s disc. Observation of the shapes of other galaxies led to the realization that ours might be a spiral type.

Today, new techniques for measuring distance n deep space are helping astronomers put together a picture of the true shape of our Milky Way galaxy, although much debate remains about details such as the exact shape and location of the spiral arms and central bar.

·         Stunning Photos of Our Milky Way Galaxy

·         Milky Way Slams Into Andromeda (Artist Images)

·         The Big Picture on the Milky Way

·         Galaxy Smash-Up: Milky Way and Andromeda On Collision Course | Video

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Karl Tate
Space.com contributor

Karl's association with Space.com goes back to 2000, when he was hired to produce interactive Flash graphics. From 2010 to 2016, Karl worked as an infographics specialist across all editorial properties of Purch (formerly known as TechMediaNetwork).  Before joining Space.com, Karl spent 11 years at the New York headquarters of The Associated Press, creating news graphics for use around the world in newspapers and on the web.  He has a degree in graphic design from Louisiana State University and now works as a freelance graphic designer in New York City.