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Sun
The
sun
is a
mas
sive
ball
of g
as a
nd th
e la
rges
t bod
y in
the
sola
r sys
tem
.
Diam
eter
86
3,40
0 m
iles
(1,3
90,0
00 k
m)
Surf
ace
Tem
pera
ture
10
,800
° F (6
,000
° C)
Inte
rior
Tem
pera
ture
27
,000
,000
° F
(15,
000,
000°
C)
Rota
tiona
l Per
iod
25–3
6 da
ys
Estim
ated
Age
4.
5 bi
llion
yea
rs
Prim
ary
Chem
ical
Co
mpo
nent
Hy
drog
en
Mer
cury
M
ercu
ry is
the
clos
est p
lane
t to
the
sun
and
the
smal
lest
in th
e so
lar s
yste
m.
Diam
eter
3,
031
mile
s (4
,880
km
)
Nat
ural
Sat
ellit
es
0
Dist
ance
from
the
Sun
35,9
74,2
72 m
iles
(57,
910,
000
km)
Rota
tiona
l Per
iod
58.6
5 da
ys
Orb
ital P
erio
d 87
.97
days
Surf
ace
Tem
pera
ture
35
4° F
(179
° C)
Mai
n At
mos
pher
ic
Com
pone
nt
Heliu
m
Venu
s
The
seco
nd p
lane
t fro
m th
e su
n, c
loud
-co
vere
d Ve
nus r
otat
es fr
om e
ast t
o w
est.
Diam
eter
7,
518
mile
s (1
2,10
3 km
)
Nat
ural
Sat
ellit
es
0
Dist
ance
from
the
Sun
67,2
14,9
20 m
iles
(108
,200
,000
km
)
Rota
tiona
l Per
iod
243.
0 da
ys
Orb
ital P
erio
d 22
4.7
days
Surf
ace
Tem
pera
ture
89
9° F
(482
° C)
Mai
n At
mos
pher
ic
Com
pone
nt
Carb
on D
ioxi
de
Eart
h
The
only
pla
net w
ith li
quid
wat
er o
n its
su
rfac
e, it
is th
e on
ly p
lane
t to
supp
ort l
ife.
Diam
eter
7,
924
mile
s (1
2,75
6 km
)
Nat
ural
Sat
ellit
es
1
Dist
ance
from
the
Sun
92,9
33,0
00 m
iles
(149
,600
,000
km
)
Rota
tiona
l Per
iod
23 h
ours
, 56
min
s
Orb
ital P
erio
d 36
5.2
days
Surf
ace
Tem
pera
ture
35
4° F
(179
° C)
Mai
n At
mos
pher
ic
Com
pone
nt
Nitr
ogen
Mar
s
The
four
th p
lane
t fro
m th
e su
n is
a ba
rren
, ro
cky,
rust
y re
d w
orld
. Di
amet
er
4,22
0 m
iles
(6,7
94 k
m)
Nat
ural
Sat
ellit
es
2
Dist
ance
from
the
Sun
141,
050,
000
mile
s (2
27,9
40,0
00 k
m)
Rota
tiona
l Per
iod
24.6
2 ho
urs
Orb
ital P
erio
d 68
7 da
ys
Surf
ace
Tem
pera
ture
-8
1° F
(-63
° C)
Mai
n At
mos
pher
ic
Com
pone
nt
Carb
on D
ioxi
de
Aste
roid
s and
Com
ets
Aste
roid
s are
big
spac
e ro
cks l
eft o
ver f
rom
w
hen
the
sola
r sys
tem
form
ed a
bout
4.6
bi
llion
yea
rs a
go. M
ost a
ster
oids
orb
it th
e su
n w
ithin
the
mai
n as
tero
id b
elt b
etw
een
Mar
s and
Jupi
ter.
Num
ber o
f kno
wn
aste
roid
s: 7
94,7
70
Com
ets a
re th
e ol
dest
, mos
t prim
itive
bo
dies
in th
e So
lar S
yste
m. T
hey
are
huge
sn
owba
lls o
f fro
zen
gase
s, ro
ck, a
nd d
ust
that
orb
it th
e su
n. W
hen
clos
e to
the
sun,
a
com
et h
eats
up,
and
its d
ust a
nd g
ases
form
a
tail
that
stre
tche
s for
mill
ions
of m
iles.
N
umbe
r of k
now
n co
met
s:
3
,570
Jupi
ter
Alm
ost t
wic
e th
e siz
e of
all
of th
e ot
her
plan
ets c
ombi
ned
and
has a
gia
nt re
d sp
ot.
Di
amet
er
88,8
23 m
iles
(142
,984
km
)
Nat
ural
Sat
ellit
es
64 k
now
n
Dist
ance
from
the
Sun
482,
546,
000
mile
s (7
78,3
30,0
00 k
m)
Rota
tiona
l Per
iod
9.84
hou
rs
Orb
ital P
erio
d 43
33 d
ays
Clou
d Te
mpe
ratu
re
-185
° F (-
121°
C)
Mai
n At
mos
pher
ic
Com
pone
nt
Hydr
ogen
Satu
rn
Satu
rn, a
gas
gia
nt w
ith th
ree
mai
n ba
nds o
f rin
gs, i
s cal
led
the
jew
el o
f the
sola
r sys
tem
.
Diam
eter
74
,565
mile
s (1
20,5
36 k
m)
Nat
ural
Sat
ellit
es
62
Dist
ance
from
the
Sun
884,
740,
000
mile
s (1
,429
,400
,000
km
)
Rota
tiona
l Per
iod
10.2
5 da
ys
Orb
ital P
erio
d 29
.46
year
s
Clou
d Te
mpe
ratu
re
-193
° F (-
125°
C)
Mai
n At
mos
pher
ic
Com
pone
nt
Hydr
ogen
Ura
nus
The
only
pla
net t
hat r
otat
es o
n its
side
, U
ranu
s is a
feat
urel
ess b
lue-
gree
n sp
here
.
Diam
eter
31
,755
mile
s (5
1,11
8 km
)
Nat
ural
Sat
ellit
es
27
Dist
ance
from
the
Sun
1,78
3,48
7,00
0mile
s (2
,870
,990
,000
km
)
Rota
tiona
l Per
iod
17.3
hou
rs
Orb
ital P
erio
d 84
yea
rs
Clou
d Te
mpe
ratu
re
-315
° F (-
193°
C)
Mai
n At
mos
pher
ic
Com
pone
nt
Hydr
ogen
Nep
tune
A
gian
t blu
e sp
here
with
unu
sual
clo
ud
feat
ures
and
a th
in, d
ark
syst
em o
f rin
gs.
Diam
eter
30
,744
mile
s (4
9,49
2 km
)
Nat
ural
Sat
ellit
es
13
Dist
ance
from
the
Sun
2,79
8,11
6,00
0mile
s (4
,504
,300
,000
km
)
Rota
tiona
l Per
iod
15.8
hou
rs
Orb
ital P
erio
d 16
5 ye
ars
Clou
d Te
mpe
ratu
re
-315
° F (-
193°
C)
Mai
n At
mos
pher
ic
Com
pone
nt
Hydr
ogen
Plut
o
Plut
o is
offic
ially
cla
ssifi
ed a
s a d
war
f pla
net
and
has a
n ov
al a
nd ti
lted
orbi
t.
Diam
eter
1,
473
mile
s (2
,370
km
)
Nat
ural
Sat
ellit
es
5
Dist
ance
from
the
Sun
3,67
3,53
7,00
0mile
s (5
,913
,520
,000
km
)
Rota
tiona
l Per
iod
6.3
days
Orb
ital P
erio
d 24
8 ye
ars
Surf
ace
Tem
pera
ture
-3
82° F
(-23
0° C
)
Mai
n At
mos
pher
ic
Com
pone
nt
Met
hane
Moo
n O
ur m
oon
is th
e 5t
h la
rges
t of t
he 1
90+
moo
ns o
rbiti
ng p
lane
ts in
the
sola
r sys
tem
.
Diam
eter
2,
160
mile
s (3
,476
km
)
Nat
ural
Sat
ellit
es
0
Dist
ance
from
the
Eart
h 23
8,80
0 m
iles
(384
,400
km
)
Rota
tiona
l Per
iod
27.3
2 da
ys
Orb
ital P
erio
d 27
.32
days
Surf
ace
Tem
pera
ture
0°
F (-
17° C
)
Mai
n At
mos
pher
ic
Com
pone
nt
Hydr
ogen
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