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Quick Reference of Space Dimensions

  • 10 million trillion atoms in one cc of air at sea level.
  • 1 atom only per cc in the void between stars.
  • 1 atom only per cm in the void between galaxies.
  • Earth is 5 billion years old and 7,921 miles in diameter.
  • Distance to our moon is 238,774 miles.
  • Distance to our sun is 93,150,000 miles = 1 AU.
  • Distance to Pluto's orbit varies between 26 to 52 AU.
  • Distance to nearest star, Alpha Centaurus, is 4.3 LY
  • Speed of Light = 186,170 miles/sec.
  • 1 AU = 8 minutes at Speed of Light.
  • Light travels in 1 light year 5.9 trillion miles. 1 LY = 65,555 AU
  • Milky Way Galaxy is 90,000 Light Years wide and 3,000 LY thick.
  • Estimated number of stars in the Milky Way Galaxy: 400 billion +
  • Estimated number of galaxies in universe: 50 billion+
  • Estimated number of stars in universe: 5 billion trillion.
  • Estimated age of universe: 14 to 16 billion years.

The Hubble Telescope Deep Field image reveals unknown galaxies in a sector the size of a grain of salt held at arms length.

Hubble Deep Field (full mosaic) released by NASA on January 15, 1996.

 

 

Comparative Data on the Terrestrial Planets

Quantity

Earth

Mercury

Venus

Mars

Equatorial diameter (Km)

12756

4878

12104

6794

Density (kg/m')

5517

5500

5250

3933

Mass (Earth-1)

1.0

0.055

0.815

0.107

Surface gravity (Earth=1)

1.0

0.38

0.903

0.38

Escape velocity (km/s)

11.2

4.3

10.36

5.03

Mean distance from sun (Au)

1.0

0.3870987

0.7233322

1.5236915

Mean distance from sun (miles)

9.3x10(7)

3.599x10(7)

6.7239x10(7)

1.4136x10(8)

Mean distance from sun (10(6) Km)

149.6

57.9

108.2

227.9

Orbital period (Earth years)

1.0

0.241

0.615

1.88

Orbital period (Earth days)

365.24

87.97

224.68

686.95

Orbital velocity (Km/sec)

29.79

47.89

35.03

24.13

Avg. Surface Temperature (K)

280

400

730

210

Comparative Data on the Jovian Planets and Pluto

Quantity

Jupiter

Saturn

Uranus

Neptune

Pluto

Equatorial diameter (Km)

142796

120000

50800

48600

3300-2800(?)

Density (kg/cm(3))

1330

706

1270

1700

2000?

Mass (Earth=1)

1318.7

743.6

14.6

17.2

0.0025?

Surface gravity (Earth=1)

2.643

1.159

1.11

1.21

?

Escape velocity (km/s)

60.22

32.26

22.5

23.9

?

Mean distance from sun (AU)

5.2028039

9.5388437

19.181843

30.057984

39.4

Mean distance from sun (miles)

4.836x10(8)

8.8722x10(8)

1.7837x10(8)

2.7946x10(8)

3.6642x10(8)

Mean distance from sun (10(6)Km)

778.3

1427.0

2869.0

4497.1

5900

Orbital period (Earth years)

11.867

29,461

84,013

164,793

247.7

Orbital period (Earth days)

4334.3

10,760

30,685

60,189

90,465

Orbital velocity (Km/sec)

13.06

9.64

6.81

5.43

4.74

Ave. Surface Temperature (K)

125

95

60

60

 

Satellites of Planets in the Solar System

Planet

Name of Satellite

Average Diameter in Km

Earth

Moon

3476

Mars

Phobos
Deimos

24
14

Jupiter

Metis
Adrastea
Amalthea
Thebe
lo
Europa
Ganymede
Callisto
Leda
Himalia
Lysithea
Elara
Anake
Carme
Pasiphae
Sinope

40
40
170
100
3630
3140
5260
4800
15
185
35
75
30
40
50
35

Saturn

Pan
Atlas
Prometheus
Pandora
Janus
Epimetheus
Mimas
Enceladus
Tethys
Telesto
Calpyso
Dione
Helene
Rhea
Titan
Hyperion
Iapetus
Phoebe

20
30
100
90
190
120
380
500
1050
25
25
1120
30
1530
5150
255
1440
220

Uranus

Cordelia
Ophelia
Bianca
Cressida
Desdemona
Juliet
Portia
Rosaline
Belinda
Puck
Miranda
Ariel
Umbrial
Titania
Oberon

25
30
45
65
60
85
110
60
68
155
470
1160
1170
1580
1520

Neptune

Naiad
Thalassa
Despina
Galatea
Larissa
Proteus
Triton
Neried

60
80
150
160
190
420
2700
340

Pluto

Charon

1200


An Overview of Astronomy

A Concise Guide to the Universe

 



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