` Earth-Like Planet Calculator
Milky Way Galaxy Atlas
Planet Earth

Planet Earth
Our Home Planet
Only Known Home for Life




Earth-Like Planet Calculator

This calculator allows you to select from 21 criteria to see how "Earth-like" a planet might be. Feel free to change and experiment with this calculator to see how a planets' Earth-like status can vary. The ESC for planet Earth equals 100%.

Is the planet located in the Habitable Zone of its Star?
[The distance from the star where liquid water could exist with a sufficient atmosphere]
{ Earth = Yes}

Yes (5 Points)
No (0 Points)
Unknown (0 Points)

Is the planet tidally locked with its Star?
[One side of the planet permanently faces the star]
{Earth = No}

Yes (0 Points)
No (5 Points)
Unknown (0 Points)

What is the Axial Title of the Planet?
[The Earth's title causes seasons]
{Earth Axial Tilt = 23.5 °}

18.9 ° or Less {Not Similar} (0 Points)
19.0 ° to 19.9 ° {Earth Related} (1 Point)
20.0 ° to 20.9 ° {Earth Similar} (2 Points)
21.0 ° to 21.9 ° {Earth Like} (3 Points)
22.0 ° to 22.9 ° {Earth Analog} (4 Points)
23.0 ° to 24.0 ° {Earth Twin} (5 Points)
24.1 ° to 25.0 ° {Earth Analog} (4 Points)
25.1 ° to 25.9 ° {Earth Like} (3 Points)
26.0 ° to 26.9 ° {Earth Similar} (2 Points)
27.0 ° to 27.9 ° {Earth Related} (1 Point)
28.0 ° or More {Not Similar} (0 Points)



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.




#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

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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

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Habitable Zones Around Main-Seqence Stars
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