Astronomy Chapter 5 Part I - Waynesboro High...
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Astr
onom
y C
hapte
r 5
•T
here
are
thre
e m
ain
devic
es for
gettin
g
radia
tion fro
m s
pace.
•O
ne is the tele
scope.
Secon
d is a
radia
tio
n s
ort
er
att
ached t
o t
he t
ele
scope.
Third a
re d
ete
cto
rs f
or
cert
ain
types
of
radia
tion.
Galil
eo h
ea
rd a
bo
ut
a t
ele
scope
invente
d b
y H
ans L
ipp
ers
hay
We g
ath
er
light
with
a lense
or
a
mir
ror.
Then y
ou g
ath
er
the info
.
•F
irst you w
rote
it dow
n.
•19
thcentu
ry y
ou took p
hoto
gra
phs.
•T
hen tv
cam
era
s.
Today C
CD
’s
•C
harg
e c
ouple
d d
evic
es.
A lens b
en
ds lig
ht
to a
poin
t calle
d
a f
ocus
A r
efr
acto
ry tele
sco
pe h
as t
wo
lenses.
Larg
est
refr
acting t
ele
sco
pe in t
he
worl
d,
40 inch a
t Y
erk
es
observ
ato
ry in W
isconsin
.
Leand
er
McC
orm
ick a
t U
VA
The o
ther
main
type is a
Reflecting
tele
scope.
•T
his
is a
concave m
irro
r m
ade o
f gla
ss
coate
d w
ith s
ilver
or
alu
min
um
.
•
Ne
wto
n inve
nte
d t
he f
irst one in
166
8
Larg
e c
onca
ve m
irro
r be
nds lig
ht
to
a p
rim
e f
ocus.
Todays
tele
scopes a
re 8
to 1
0
mete
rs a
cro
ss.
The K
eck t
ele
scop
es o
n M
aun
a
Kea u
ses 3
6 h
exag
onal m
irro
rs
each b
ein
g 1
.8 m
ete
rs.
Atm
osphe
re m
esses u
p o
ur
vis
ion
4 w
ays.
To p
ick a
site y
ou n
ee
d.
•C
lear
75%
of th
e tim
e.
•D
ry w
ith h
igh a
ltitude.
•N
o lig
hts
aro
und d
ark
sky.
•A
ir s
hould
be s
teady low
turb
ule
nts
.