Milky Way Galaxy Star and Planet Atlas                               4,197 Planets Discovered and counting....
Terran Sized Planets: 16
Terran Sized Planets in Hab Zone: 6
Earthlike Planets Candidates: 5
Truly Earthlike Planets: 1
Milky Way Galaxy Atlas

Star Picture
Surface
Temp
Core
Temp
Star
Description
Hyper Giant
Class


? K to 53,000 K
? F to 94,940 F




?
75 to 315
501 to 2,100

Older O,B,A,F,G,K,M Stars


Super Giant
Class


4,000 K to 40,000 K
6,740 F to 71,540 F




?
10 to 70
30 to 500

Older O,B,A,F,G,K,M Stars


Giant
Class


3,000 K to 10,000 K
4,940 F to 17,540 F




?
1 to 5
10 to 50

Older G,K,M Stars


Wolf Rayet
Class


53,000 K to 200,000 K
94,940 F to 359,540 F




?
20 to 74
2 to 25




O
Class


30,000 K to 52,000 K
53,540 F to 93,140 F




?
16 to 25
6.6 to 10




B
Class


10,000 K to 29,999 K
17,540 F to 53,538 F




?
2.1 to 15
1.8 to 6.5




A
Class


7,500 K to 9,999 K
13,040 F to 17,538 F




?
1.4 to 2.1
1.4 to 1.7




F
Class


6,000 K to 7,499 K
10,340 F to 13,038 F




?
1.04 to 1.3
1.15 to 1.3




G
Class
(Our Sun)


5,200 K to 5,999 K
8,900 F to 10,338 F




10 Million K to 15 Million K
18 Million F to 27 Million F
0.80 to 1.03
0.96 to 1.14




K
Class


3,700 K to 5,199 K
6,200 F to 8,898 F




?
0.45 to 0.70
0.70 to 0.95




M
Class


2,400 K to 3,699 K
3,860 F to 6,198 F




?
0.08 to 0.44
0.69 or Less




L
Class


1,300 K to 2,000 K
1,880 F to 3,140 F




?
51 to 80 Jupiter Masses
Similar to Jupiter




T
Class


700 K to 1299 K
800 F to 1,878 F




?
26 to 50 Jupiter Masses
Similar to Jupiter




Y
Class


440 K to 699 K
332 F to 798 F




?
14 to 25 Jupiter Masses
Similar to Jupiter




Sub-BD
Class


225 K to 439 K
-54 F to 330 F




?
3 to 13 Jupiter Masses
Similar to Jupiter




D
Class
(White Dwarf)


4,000 K to 150,000 K
6,740 F to 269,540 F




2.5 Million K to 1 Billion K
4.5 Million F to 1.8 Billion F
0.17 to 1.33
8,700 Miles




Neutron Star


600,000 K to 1,000,000 K
1,079,540 F to 1,799,540 F




1 Trillion K
1.8 Trillion F
1.1 to 3.3
12.4 Miles




Black Hole


0 K to 2.7 K
-459 F to -454 F




Unknown
or not possible
3.8 to 40 Billion
15 to 146.6 Billion Miles





Planet Picture

Earth Masses

Earth Diameter

Planetary Notes

Planet Example
Super Jovian


318 Earth Masses
(1.0 Jupiter Mass)
to
4,135 Earth Masses
(13 Jupiter Mass)




10 to 15
Ultra Thick Atmosphere
No Surface
Not Habitable
Jupiter
Jovian


51 Earth Masses
(0.16 Jupiter Mass)
to
317 Earth Masses
(0.99 Jupiter Mass)




4.01 to 9.99
Ultra Thick Atmosphere
No Surface
Not Habitable
Saturn
Neptunian


10 to 50
Earth Masses




3.00 to 4.00
Very Thick Atmosphere
No Surface
Not Habitable
Uranus, Neptune, Planet 9
Sub-Neptunian


2.1 to 9.99
Earth Masses




1.26 to 2.99
Thick Atmosphere
No Surface
Not Habitable
Gliese 3634 b
Super Terran


1.26 to 2.00
Earth Masses




1.03 to 1.25
Significant Atmosphere
Rocky Surface
Could be Habitable
Unknown
Terran


0.51 to 1.25
Earth Masses




0.80 to 1.02
Significant Atmosphere
Rocky Surface
Could be Habitable
Venus, Earth
Sub-Terran


0.11 to 0.50
Earth Masses




0.50 to 0.79
Thin Atmosphere
Rocky Surface
Could be Habitable
Mars
Mercurian


0.006 to 0.10
Earth Masses




0.21 to 0.49
Very Thin or No Atmosphere
Rocky Surface
Not Habitable
Mercury
Plutonian


0.00016 to 0.005





0.081 to 0.20
Very Thin or No Atmosphere
Rocky Surface
Not Habitable
Pluto
Asteroidan


0.00015 or Less
Earth Masses




0.080 or Less
No Atmosphere
Rocky Surface
Not Habitable
Ceres
Atmosphere
Class

Planet Picture

Atmospheric Composition

Planet Example
Breathable


Nitrogen and Oxygen





Earth
Hazardous


Unknown





Unknown
Poisonous


Unknown





Unknown
Toxic


Carbon Dioxide





Venus, Mars
Average Global
Planet Temperature

Planet Picture

Planet Example



Inferno
1,201 °
Fahrenheit or higher






Planet Saffar

43.900
Light Years Distant
Extremely Hot
801 ° Fahrenheit
to
1,200 ° Fahrenheit





Planet Venus

Very Hot
401 ° Fahrenheit
to
800 ° Fahrenheit





Planet Ross 780 b

15.3420
Light Years Distant
Hot
96 ° Fahrenheit
to
400 ° Fahrenheit





Planet Tau Ceti d

11.8870
Light Years Distant
Warm
45 ° Fahrenheit
to
95 ° Fahrenheit





Planet Earth


Cold
44 ° Fahrenheit
to
-200 ° Fahrenheit





Planet Mars


Freezing
-201 ° Fahrenheit
or below





Planet Jupiter


Surface
Class

Planet Picture

Surface Composition

Planet Example
Rocky


Solid Rock Surface





Earth
Gaseous


No Solid Rock Surface





Jupiter
Terrain
Class

Planet Picture

Terrain Composition

Planet/Moon Example
Varied


Grasslands, Foerst, Jungle, Mountains, Volcanic, Plains, Tundra, Ice





Earth
Cratered


Surface is dominated by Craters





Mercury
Volcanic


Surface dominated by Volanic Activity





Venus
Frozen


Surface is dominated by Ice





Europa
Mineral
Class

Planet Picture

Core Composition

Crust Composition

Planet/Moon Example
Unknown


Iron Core




Silicon Crust
Earth
Unknown


Water Ice Core





Unknown
Unknown
Unknown


Diamond Core





Carbon Crust
Unknown
Gravity
Class

Planet Picture

Gravity Range

Planet/Moon Example
Weak


0.01 to 0.34





Unknown
Low


0.35 to 0.64





Mercury, Mars
Lower


0.65 to 0.89





Unknown
Moderate


0.90 to 1.10





Earth, Venus
Elevated


1.11 to 1.35





Neptune
High


1.36 to 1.59





Unknown
Extreme


1.60 +





Jupiter
Liquid
Class

Planet Picture

Liquid Features

Planet/Moon Example
Water


Swamp, Rivers, Lakes, Seas, Oceans




Earth
Methane


Rivers, Lakes, Oceans





Titan
Desert


No Liquid





Mars
Life
Class

Planet Picture

Type of Life

Planet Example
Plants


Planet has just Plants, no Anmials or Intelligent Beings




Unknown
Animals


Planet has Plants and Animals, but no Intelligent Life





Unknown
Intelligent Beings


Planet has Plants, Animals, and Intelligent beings





Earth
Earthlike Planet
Criteria
Habitable Zone

(Distance from star where
water is possible with a
sufficient atmosphere)
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Tidally Locked

(Same side of the planet
always faces its star)
Yes
No
No
No
No
No
No
No
No
No
Yes
Axial Tilt

(The Earth's tilt causes seasons)
18.9 °
or Less

19.0 °
to
19.9 °

20.0 °
to
20.9 °

21.0 °
to
21.9 °

22.0 °
to
22.9 °

23.0 °
to
24.0 °

24.1 °
to
25.0 °

25.1 °
to
25.9 °

26.0 °
to
26.9 °

27.0 °
to
27.9 °

28.0 °
or More

Orbit Eccentricity

(How closely an orbit
is to a perfect circle)
Perfect Circle = 0
0.0119
or Less

0.0120
to
0.0129

0.0130
to
0.0139

0.0140
to
0.0149

0.0150
to
0.0159

0.0160
to
0.0170

0.0171
to
0.0180

0.0181
to
0.0190

0.0191
to
0.0200

0.0201
to
0.0210

0.0211
or More

Size
Other Sizes
Terran
Terran
Terran
Terran
Terran
Terran
Terran
Terran
Terran
Other Sizes
Earth Mass
0.74
or Less

0.75
to
0.82

0.83
to
0.87

0.88
to
0.92

0.93
to
0.97

0.98
to
1.02

1.03
to
1.07

1.08
to
1.12

1.13
to
1.17

1.18
to
1.25

1.26
or More

Diameter
6,333 Miles
or Less

6,334 Miles
to
7,125 Miles

7,126 Miles
to
7,521 Miles

7,522 Miles
to
7,679 Miles

7,680 Miles
to
7,838 Miles

7,839 Miles
to
8,075 Miles

8,076 Miles
to
8,234 Miles

8,235 Miles
to
8,392 Miles

8,393 Miles
to
8,788 Miles

8,789 Miles
to
9,502 Miles

9,503 Miles
or More

Density
4.99
or Less

5.00
to
5.14

5.15
to
5.24

5.25
to
5.34

5.35
to
5.44

5.45
to
5.55

5.56
to
5.65

5.66
to
5.75

5.76
to
5.85

5.86
to
6.00

6.01
or More

Earth Gravity
0.89
or Less

0.90
to
0.91

0.92
to
0.93

0.94
to
0.95

0.96
to
0.97

0.98
to
1.02

1.03
to
1.04

1.05
to
1.06

1.07
to
1.08

1.09
to
1.10

1.11
or More

Atmosphere
Toxic
?
?
?
?
78%
Nitrogen

21%
Oxygen

?
?
?
?
Toxic
Atmosphere Pressure
0.79
or Less

0.80
to
0.82

0.83
to
0.87

0.88
to
0.92

0.93
to
0.97

0.98
to
0.102

0.103
to
0.107

0.108
to
0.112

0.113
to
0.117

0.118
to
0.120

0.121
or More

Ozone Layer

No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Magnetic Field

(Protects a planet from
solar flares and space radiation)
0.79
or Less

0.80
to
0.82

0.83
to
0.87

0.88
to
0.92

0.93
to
0.97

0.98
to
0.102

0.103
to
0.107

0.108
to
0.112

0.113
to
0.117

0.118
to
0.120

0.121
or More

Parent Star
Solar Flares
Weak
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Extreme
Flares

Average
Temperature
Cold
to
Freezing

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Warm
(45 ° to 95 °)

Hot
to
Inferno

Greenhouse
Effect
Lower
and
Below

Moderate
Moderate
Moderate
Moderate
Moderate
Moderate
Moderate
Moderate
Moderate
Elevated
and
Higher

Liquid Water

No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Land

No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Plants

No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Animals

No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Intelligent Beings

No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Stabilizing Moon

(Stabilizes the tilt of the planet axis. Without a moon, a planet's tilt axis would vary more, with potentially stronger climatic effects)
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Planet
Class
Atmosphere
Class
Terrain
Class
Paradise

Warm
Breathable




Rocky
Grasslands, Plains, Forest,
Jungle, Mountains





Iron/Nickel Core
Silcon Crust

Moderate
Liquid
Water
Oceans

Terran
Unknown
Gaia

Warm
Breathable




Rocky
Grasslands, Plains, Forest,
Jungle, Mountains





Iron/Nickel Core
Silicon Crust

Moderate
Liquid
Water
Oceans

Water
Ice
Caps

Terran
Unknown
Lush

Warm
Breathable




Rocky
Grasslands, Plains, Forest,
Jungle, Mountains, Volcanoes,
Tundra, Desert





Iron/Nickel Core
Silicon Crust

Moderate
Liquid
Water
Oceans

Water
Ice
Caps

Terran
Earth
Arid

Warm
Breathable




Rocky
Grasslands, Plains, Mountains, Volcanoes, Tundra, Desert




Iron/Nickel Core
Silicon Crust

Moderate
Liquid
Water
Lakes

Terran
Unknown
Barren
Freezing
to
Inferno
Toxic
to
Breathable




Rocky
Rock Plains, Mountains,
Volcanoes, Desert





Iron/Nickel Core
Silicon Crust

Weak
to
Extreme
No
Liquid
Water

Water
Ice
Caps

Plutonian
to
Super Terran
Mars
Desolate
Freezing
to
Inferno
No Atmosphere





Rocky
Cratered




Iron/Nickel Core
Silicon Crust

Weak
to
Extreme
No
Liquid
Water

Water
Ice
Possible

Plutonian
to
Super Terran
Moon
Radiated
Freezing
to
Inferno
No Atmosphere
to
Hazardous




Rocky
Cratered, Rock Plains, Mountains,
Volcanoes, Desert





Iron/Nickel Core
Silicon Crust

Weak
to
Extreme
Varies
Plutonian
to
Super Terran
Mercury
Hellish
Very Hot
to
Inferno
Toxic





Rocky
Rock Plains, Mountains,
Volcanoes, Flowing Lava, Desert





Iron/Nickel Core
Silicon Crust
or
Sulfur Crust
Weak
to
Extreme
No
Liquid
Water
or Ice

Plutonian
to
Super Terran
Venus
Io

Frozen
Freezing
No Atmosphere
to
Hazardous





Rocky
Rock Plains and Mountains





Iron/Nickel Core

Water
Ice
Crust

Weak
to
Extreme
Liquid
Water
below
Crust

Plutonian
to
Super Terran
Europa
Ganymede
Callisto
Enceladus

Ice Dwarf
Freezing
Toxic
to
Hazardous




Gaseous
No Surface





Rock &
Ice
Core

Moderate
to
Extreme
No
Liquid
Water

Sub Neptunian

Unknown
Ice Giant
Freezing
Toxic
to
Hazardous




Gaseous
No Surface





Rock &
Ice
Core

Moderate
to
Extreme
No
Liquid
Water

Neptunian
Uranus
Neptune

Gas Dwarf
Freezing
to
Inferno
Toxic
to
Hazardous




Gaseous
No Surface





Rock &
Metal
Core

Moderate
to
Extreme
No
Liquid
Water

Jovian
Saturn
Gas Giant
Freezing
to
Inferno
Toxic
to
Hazardous




Gaseous
No Surface





Rock &
Metal
Core

Moderate
to
Extreme
No
Liquid
Water

Super Jovian
Jupiter
Alien

Freezing
to
Cold
Toxic
to
Hazardous




Rocky
Rock Plains and Mountains





Silicate
Rock
Core

Water
Ice
Crust

Weak
to
Extreme
Liquid
Methane
&
Ethane
Lakes

Plutonian
to
Super Terran
Titan
Carbon

Freezing
to
Cold
Toxic
to
Hazardous




Rocky
Rock Plains and Mountains





Iron or
Steel Core
Graphite &
Diamond
Layer
Hydrocarbon
Crust

Weak
to
Extreme
Hydro-
carbon
Oil
Rivers

Plutonian
to
Super Terran
55 Cancri e?

Picture

Description

Mass

Example

Star


Has enough mass to sustain
Thermonuclear Fusion
0.08 Solar Masses or more
Sol
(Our Sun)

Brown Dwarf


Does not have enough mass to sustain
Thermonuclear Fusion. A Failed Star.
13 to 80 Jupiter Mass
Luhman 16

Rogue Planet
?

Does not orbit a star

0.002 Earth Mass
to
5 Jupiter Mass
None

Major Planet


Orbits a star, has enough mass to be round, and has cleared the neighborhood of its orbit.
0.006 Earth Mass
to
5 Jupiter Mass
Gliese 3021 b

Dwarf Planet


Orbits a star, has enough mass to be round, and has not cleared the neighborhood of its orbit.
0.00016
to
0.005 Earth Mass
Pluto, Ceres

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

3,735
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



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