` Earth-Like Planets
Milky Way Galaxy Atlas
Planet Earth

Planet Earth
Only Known Home for Life

Earth-Like Calculator



Earth-Like Planets

Our ultimate goal as a species is to discover another planet that is like Planet Earth!

The following list of planets are the ones that are closest to being Earth-like given the amount of data that is currently available. It should not be assumed that a planet is in any way habitable like Earth just because it appears in this list. There is much more data that must be gathered about these planets to determine how truly "Earth-like" they may be.

To appear on this list, a planet must be in the habitable zone, be Terran size and mass, and have a temperature that is cold or warm.

There are currently 8 planets that appear on this list, including planet Earth of course. However, none of these planets are currently regarded as Earth-like. They are simply the closest planets that we have discovered that have some similarities to 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 21 Criteria are as follows:

1. Whether a planet is in the habitable zone of their star (the area where liquid water could exist)
2. If the planet is tidally locked (one side always faces its star)
3. Axial tilt
4. Orbit Eccentricity (How circular the orbit is)
5. Size
6. Mass
7. Diameter
8. Density
9. Gravity
10. Atmospheric Composition
11. Atmospheic Pressure
12. Ozone Layer
13. Magnetic Field
14. Parent Star Solar Flares Intensity
15. UV Light from Parent Star
16. Average Temperature
17. Liquid Water
18. Land
19. Plants
20. Animals
21. Intelligent beings.

At this point, some of these planetary properties must still be refined and more accurately measured, and are subject to change given future data.


#1
Earth


100%
ESC


0
LY



Yes





No

23.43 °

0.0167

Terran

1.00

7,918

5.52

1.00 g
78.08%
Nitrogen

20.95%
Oxygen


1.00

Yes

1.00

Moderate

57 °
(Warm)


Yes

Yes

Yes

Yes

Humans

#2
Ross 128 b


30%
ESC


10.9190
LY



Yes





Yes

?

?

Terran

1.35

8,709

?

? g

?


?

?

?

Moderate

73 °
(Warm)


?

Likely

?

?

?

#3
Trappist-1 f


29%
ESC


39.130
LY



Yes





Yes

?

?

Terran

0.93

8,274

4.52

0.85 g

?


?

?

?

Moderate

?

Likely

Likely

?

?

?

#4
Trappist-1 e


29%
ESC


39.130
LY



Yes





Yes

?

?

Terran

0.77

7,269

5.63

0.93 g

?


?

?

?

Moderate

?

Likely

Likely

?

?

?

#5
Trappist-1 g


25%
ESC


39.130
LY



Yes





Yes

?

?

Terran

1.15

9,106

4.19

0.87 g

?


?

?

?

Moderate

?

Likely

Likely

?

?

?

#6
Kepler 186 f


14%
ESC


490.00
LY



Yes





Yes

?

?

Terran

1.40

8,607

?

? g

?


?

?

?

Moderate

?

?

Likely

?

?

?

#7
Kepler 438 b


15%
ESC


473.00
LY



Yes





Yes

?

?

Terran

1.30

8,710

?

? g

?


?

?

?

Extreme

?

?

Likely

?

?

?

#8
Proxima b


15%
ESC


4.2421
LY



Yes





Yes

?

?

Terran

1.30

8,710

?

? g

?


?

?

?

Extreme

?

?

Likely

?

?

?
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

3,775
Total Planets Discovered

0
Truly Earth-Like Planets Discovered

Articles


Exoplanet 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



Contact


Contact Form

Links

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