` Milky Way Galaxy Atlas - Visual Star and ExoPlanet Guide
Milky Way Galaxy Atlas

Galaxy Alien Planets Project Blog

Brian Done - Amateur Astronomer
Brian Done
Amateur Astronomer
I am the Creator of the Milky Way Galaxy Atlas. I love sharing my passion for Astronomy!

I invite you to explore the Atlas and participate in my Blog. I want to hear your opinions and thoughts!

Explore my Planet Blog
Estimated Planets in Milky Way
3 Trillion

Total Planets Discovered
3,848

Planets in Galaxy Atlas Database

548

Jovian Sized Planets
196 Jovian Sized Planets

Neptunian Sized Planets

105 Neptunian Sized Planets

Sub-Neptunian Sized Planets
63 Sub-Neptunian Sized Planets

Super Terran Sized Planets
79 Super Terran Sized Planets

Terran Sized Planets
38 Terran Sized Planets
0 Truly Earth-like Planets

Sub-Terran Sized Planets
16 Sub-Terran Planets

Mercurian Sized Planets
5 Mercurian Planets


Estimated Stars in Milky Way
400 Billion

Stars in Galaxy Atlas Database
903


Wolf Rayet Class Star

1 Wolf Rayet Class Star


O Class Stars

9 O-Class Stars


B Class Stars

112 B-Class Stars


A Class Stars

64 A-Class Stars


F Class Stars


80 F-Class Stars


G Class Stars


206 G-Class Stars


K Class Stars


146 K-Class Stars


M Class Stars

183 M-Class Stars

L Brown Dwarf Stars

8 L-Class Brown Dwarf Stars

T Brown Dwarf Stars
9 T-Class Brown Dwarf Stars

Y Brown Dwarf Stars

8 Y-Class Brown Dwarf Stars

Sub Brown Dwarf Stars

1 Sub-Class Brown Dwarf Stars

White Dwarf Stars

10 D-Class White Dwarf Stars

Neutron Stars

6 Neutron Stars

Black Holes

2 Black Holes


Milky Way Galaxy Atlas: A Visual Star and ExoPlanet Guide

Do you ever wonder how many planets are in the Milky Way Galaxy when you look up at the night sky? If so, keep reading!

Milky Way Galaxy Atlas is dedicated to providing you with the most comprehensive visual list of solar systems, exoplanets, and earth-like planets in the Milky Way Galaxy. In essence, this is a list of planets outside of our Solar System. You may have asked yourself the following questions about planets:

Question: How many planets are outside our Solar System?
Answer: We have currently discovered 3,848 planets outside our Solar System.

Question: What is the closest planet outside our Solar System?
Answer: The closest planet to our Solar System is the planet Proxima b. Proxima b orbits the Red Dwarf star Proxima Centauri. Proxima b is located 4.2421 light years away from Earth.

Question: When did we discover planets outside our Solar System?
Answer: The first planet to be discovered outside of our Solar System orbits a Pulsar star and was discovered in 1992.

Our list of planets and stars contains detailed information and visual depictions of each star and planet. Solar systems consist of one or more stars at the center, and can have planets rotating around those stars in orbits. Our Solar System is named after our Sun. Our Sun is named Sol. Thus, the term "solar" is named after our Sun. Planets that are found outside of our Solar System are known as "exoplanets." We have created a map of the galaxy to show you where the Sun is located in Milky Way Galaxy.

Most of us are fascinated by the concept of new planets or worlds being discovered in our galaxy. We naturally look up at the stars at night and wonder about how many planets there are in our galaxy, which is known as the Milky Way Galaxy. There are many new planets that have already been discovered in our galaxy! The type of planets that are being found are very diverse. Some are very different from any planet that is in our solar system. We have created a galaxy legend for stars and planets to show you how they are classified. There are 8 major types of planets that are being discovered. These planets are categorized by size and are as follows: Asteroidans (Ceres and Vesta), Plutonians (Pluto), Mercurians (Mercury), SubTerrans (Mars), Terrans (Venus and Earth), Super Terrans, SubNeptunians, Neptunians (Uranus, Neptune, Planet 9), and Jovians (Jupiter and Saturn).

Some of these planet types are unique to our Milky Way Galaxy Atlas, specifically Asteroidans, Plutonians, and SubNeptunians. These planet types are a natural extension of the other planet types. In addition to being categorized by size, planets that have been found are also categorized according to their temperature and potential habitability. The stars and planets in our list are listed according their the distance in light years (LY) from our Solar System. As an example, at the top of the page under Star Systems, it says "0 to 25 LY." This is a list of all of the stars and planets that are located 0 to 25 light years away from our Solar System. A light year is defined as the distance that light travels in one Earth year, or 5.88 trillion miles. Light travels so fast, that a beam of light would travel around Earth 7 times in 1 second!

As scientists discover more and more planets, we are learning that planets are to be found everywhere throughout the Galaxy. Planets seem to be very common throughout the Galaxy! With the intense pace of planet discoveries, many people have begun to wonder if all stars have planets. We are still in the process of being able to answer that question. However, given the large amount of planets that are being discovered, it is estimated that 75% of all stars have planets! It seems that our galaxy is teeming with planets, and possibly life. Every day it is looking like our galaxy is more and more like the fictional galaxies of Star Wars or Star Trek. Someday we hope to gain the ability to travel to these amazing new worlds! According to our current knowledge, the Milky Way Galaxy is also home to the only known life in the Universe - Humans on planet Earth! However, we are certain that intelligent life other than us exists in the Universe. We just have to find it!

As the list of known stars and planets in the Milky Way Galaxy grows, we will continue to update our planet list with the latest discoveries. We will continually list how many exoplanets have been discovered, list the names of other solar systems, and eventually, planets outside our Solar System that can support life. Please take the time to explore the Milky Way Galaxy using our extensive planet list, and be sure to check back often for new exciting star and planet updates.

What is the Milky Way Galaxy?

The Milky Way Galaxy is one of many billions of galaxies found throughout the known Universe. The Milky Way is the galaxy where our solar system is located. It is one of many spiral galaxies in the Universe. The Milky Way Galaxy is a medium-sized galaxy with a diameter of 200,000 light years across. The Milky Way is also between 10 and 13 billion years old. The Milky Way Galaxy is made of billions of stars and planets and is full of gas and dust. Our Solar System is located about 26,000 light years from the center of the galaxy. The Milky Way contains over 400 billion stars.


Where is the Milky Way Located?

The Milky Way Galaxy is located in an area of the universe known as the Local Group of Galaxies. The Local Group is comprised of more than 50 galaxies. The Local Group has a diameter of 10 million light years. The Local Group of Galaxies is located within the Virgo Supercluster of Galaxies. The Virgo Supercluster contains over 100 groups of galaxies and has a diameter of 110 million light years. The Virgo Supercluster is one of millions of Galaxy Superclusters found throughout the Universe.

How many Earth-like planets are in the Milky Way Galaxy?

Have you ever wondered if there are planets like Earth in our Milky Way Galaxy? It is estimated that there are 10 Billion Earth-like planets in the galaxy. While there are several Earth-size planets that have already been found in the Milky Way, we have not yet discovered an Earth-like planet. While a true Earth twin has yet to be found, there are some Earth-size planets that are similar in size to Earth. However, none of the Earth-size planets that we have found are considered truly similar to Earth. For a definition of what criteria a planet must have in order to be considered Earth-like, please explore our Galaxy Legend. Do not be misled by media reports saying that we have found an Earth-like planet. All of the planets that we have found that have been supposedly Earth-like are subjected to intense radiation and solar flares from their parent stars and are tidally locked (one side of the planet always faces its star). Given the intense radiation and solar flares they are receiving, it is believed that their atmospheres could have been stripped away, leaving them uninhabitable. One example of this is Proxima b. Proxima b orbits an M-Class star. While it orbits within the habitable zone, it is tidaly locked with the Proxima Centauri Star, and receives intense solar flares from the star. When searching for Earth-like planets, we are focused on finding an Earth-sized planet in the habitable zone of a G-type star like our Sun. That is not to say that habitable planets can only be found around G-type stars. Many other different star types could host habitable planets. However, in our search for "Earth-like" planets, we should be cautious about our definition.

What is an Earth Analog Planet?

An Earth Analog is a planet that we would consider as being similar to planet Earth. For a Planet to be considered truly "Earth-Like," it must meet 20 criteria. These criteria in no way indicate that other planets that are not "Earth-like", are not habitable. A planet that is not "Earth-like" may still be habitable. However, these criteria simply provide us with a framework to determine how closely a planet may resemble Earth, and thus whether life as we know it could possibly inhabit such a planet. Each criteria also has a color associated with it. These colors are defined in the Galaxy Legend, and give a general idea of how a planet ranks within the framework of the Earth Similarity Class. Any criteria that is "green," means that the planet meets that criteria for being an "Earth-like" planet.

The 20 Criteria are as follows:

Whether a planet is in the habitable zone of their star (the area where liquid water could exist), If the planet is tidally locked (one side always faces its star), Axial tilt, Orbit Eccentricity (How circular the orbit is), Size, Mass, Diameter, Density, Gravity, Atmospheric Composition, Atmospheic Pressure, Ozone Layer, Magnetic Field, Parent Star Solar Flares Intensity, Average Temperature, Liquid Water, Land, Plants, Animals, and Intelligent beings.

Is there another Planet with Life?

We simply do not know for sure if there is life on other planets. We hope that there is life on other planets. Given the number of possible Earth-Like planets in the Galaxy and the chance of advanced intelligent life evolving on one of these planets, it is estimated that there could be as many as 15,000 intelligent alien civilizations throughout the Galaxy! However, that is just an estimate. There could be many more intelligent aliens than that. There is the possibility that there could be millions of intelligent alien civilizations in the Milky Way Galaxy.

What does our Solar System consist of?

The solar system consists of the Sun, also known as Sol. The Sun is orbited by 8 major planets. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and possibly Planet 9. There is an asteroid belt between Mars and Jupiter. Beyond Neptune is the Kuiper Belt. One of the Kuiper Belt objects is Pluto.

What is at the Center of the Galaxy?

One of the amazing secrets of the galaxy, is the fact that all of these billions of stars and planets are rotating around the center of the galaxy. A supermassive Black Hole is at the center of the Galaxy ! It contains the mass of 4.5 million of our Suns and is known as Sagittarius A. It is believed that this black hole formed first, and spawned the creation of stars and planets. Thus the black hole was the catalyst to create our Milky Way Galaxy. It is also believed that a supermassive black hole lies at the center of every galaxy in the universe!


Milky Way Galaxy Habitability

Habitable Zone Ring from the Milky Way Galactic Center (Kiloparsecs): 4 to 10
Habitable Zone Ring from the Milky Way Galactic Center (Light Years): 13,046 to 32,615

Distance between our Sun and Milky Way Galaxy Center (Light Years): 26,000

Milky Way Galaxy Properties

Galaxy Classification: Barred Spiral
Galaxy Age: 13.2 Billion Years
Galaxy Mass: 1.250 Trillion Solar Masses
Galaxy Star Density: 1 Star per 284 cubic Light Years
Galaxy Radius (Light Years): 60,000
Galaxy Diameter (Light Years): 120,000
Galaxy Central Bar Length (Light Years): 25,000
Galaxy Central Black Hole Mass: 4.5 Million Solar Masses

Milky Way Galaxy Spiral Arms: Scutum-Centaurus Arm, Sagittarius Arm, Perseus Arm, Outer Arm, *Orion Spur

* Our Solar System is located within the Orion Spur

Milky Way Galaxy Stars


Estimated Number of Stars in the Milky Way Galaxy: 400 Billion
Estimated Number of Star Systems in the Milky Way Galaxy: 100 Billion

Estimated Number of O Stars in the Galaxy (0.00003%): 12 Million
Estimated Number of B Stars in the Galaxy (0.125%): 500 Million
Estimated Number of A Stars in the Galaxy (0.625%): 2.5 Billion
Estimated Number of F Stars in the Galaxy (3%): 12 Billion
Estimated Number of G Stars (Sun-like) in the Galaxy (7.5%): 30 Billion
Estimated Number of K Stars in the Galaxy (12%): 48 Billion
Estimated Number of M Stars in the Galaxy (75%): 300 Billion
Estimated Number of L Dwarfs in the Galaxy (0.3%): 1.2 Billion
Estimated Number of T Dwarfs in the Galaxy (0.3%): 1.2 Billion
Estimated Number of Y Dwarfs in the Galaxy (0.4%): 1.6 Billion
Estimated Number of White Dwarf Stars in the Galaxy (0.5%): 2 Billion

Milky Way Galaxy Planets

Estimated Number of Planets in the Milky Way Galaxy: 3 Trillion
Estimated Number of Gas Giant Planets in the Galaxy: Unknown
Estimated Number of Earth-Sized Planets in the Galaxy: 100 Billion
Estimated Number of Earth-like Planets in the Galaxy: 10 Billion

Milky Way Galaxy Civilizations

Estimated Number of Advanced Civilizations in the Milky Way Galaxy: 4,600 to 15,785
Number of Advanced Civilizations Discovered in the Milky Way Galaxy: 1 (Humans)




Theoretical Earth-like Planet

© Copyright 2018. Milky Way Galay Atlas.
All Rights Reserved.

Miky Way Galaxy By the Numbers


400 Billion
Estimated Total Stars

3 Trillion
Estimated Total Planets

3,848
Total Planets Discovered

0
Truly Earth-Like Planets Discovered

Articles


Alien Planets Project Blog
Planet Hunters

Data Sources

NASA
Exoplanet.eu
Planetary Habitability Laboratory
Open Catalogue Exchange
Habitable Zones Around Main-Seqence Stars
Wikipedia
iStockPhotos
Textures for Planets



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Links

Milky Way Galaxy Sitemap
NASA Exoplanet Blog
Space.com News
Atlas of the Universe