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Speed
of
the
passing
spaceship
Length
of
spaceship
observed
from
stationary
observer.
Relativistic
length
Contraction
When
objects
pass
by
at
speeds
which
are
significant
fractions
of
the
speed
of
light
their
lengths
measured
by
an
observer
at
rest
relative
to
the
moving
object
have
a
shorter
length
than
the
length
of
the
object
at
rest.
This
is
known
as
length
contraction.
The
length
contraction
is
much
greater
at
speeds
nearing
the
speed
of
light.
The
length
contraction
takes
place
in
the
direction
of
motion.
l`
=
measured
length
by
an
observer
in
the
stationary
reference
frame
l
=
length
of
object
measured
in
the
reference
frame
of
the
spaceship.
v
=
the
speed
of
the
reference
frame
of
the
spaceship
relative
to
the
observer
’s
c
=
speed
of
light
Special
Relativity