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




?
9 to 25 Jupiter Masses
Similar to Jupiter




Sub-BD
Class


225 K to 439 K
-54 F to 330 F




?
3 to 8 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
Jovian


51 to 5,000





4.01 to 27.00
Ultra Thick Atmosphere
No Surface
Not Habitable
Jupiter and Saturn
Neptunian


10 to 50





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


6.0 to 9.99





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


2.00 to 5.99





1.30 to 1.60
Significant Atmosphere
Rocky Surface
Could be Habitable
Tau Ceti b
Terran


0.51 to 1.99





0.80 to 1.29
Significant Atmosphere
Rocky Surface
Could be Habitable
Venus, Earth
Sub-Terran


0.11 to 0.50





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


0.006 to 0.10





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





0.080 or Less
No Atmosphere
Rocky Surface
Not Habitable
Ceres
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
0.50
or Less

0.51
to
0.64

0.65
to
0.79

0.80
to
0.89

0.90
to
0.97

0.98
to
0.102

0.103
to
0.110

0.111
to
0.120

0.121
to
0.135

0.136
to
0.159

0.160
or More

Diameter
6,333 Miles
or Less

6,334 Miles
to
6,729 Miles

6,730 Miles
to
7,125 Miles

7,126 Miles
to
7,521 Miles

7,522 Miles
to
7,839 Miles

7,840 Miles
to
7,996 Miles

7,997 Miles
to
8,314 Miles

8,315 Miles
to
8,710 Miles

8,711 Miles
to
9,422 Miles

9,423 Miles
to
10,214 Miles

10,215
or More

Density
3.49
or Less

3.50
to
3.99

4.00
to
4.49

4.50
to
4.99

5.00
to
5.34

5.35
to
5.65

5.66
to
6.00

6.01
to
6.50

6.51
to
7.00

7.01
to
7.50

7.51
or More

Earth Gravity
0.50
or Less

0.51
to
0.64

0.65
to
0.79

0.80
to
0.89

0.90
to
0.97

0.98
to
0.102

0.103
to
0.110

0.111
to
0.120

0.121
to
0.135

0.136
to
0.159

0.160
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
Extreme
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Moderate
Flares

Extreme
Flares

Average
Temperature
Other
Temps

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 °)

Other
Temps

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
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



Picture

Description

Mass

Example

Star


Has enough mass to sustain
Thermonuclear Fusion
13 Jupiter Mass or more
Sol
(Our Sun)

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

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



Contact


Contact Form

Links

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