Proxima
Centauri
is
the
closets
star
to
the
Sun
.
Proxima
Centauri
has
been
____________________
as
a
logical
first
____________________
for
____________________
travel
,
although
as
a
flare
star
it
would
not
be
particularly
____________________
.
The
current
standard
spaceship
,
the
Space
Shuttle
,
____________________
in
orbit
at
7
.
8
____________________
/
s
.
At
that
____________________
,
it
would
take
160
,
000
____________________
to
reach
Proxima
.
The
fastest
man
-
made
spacecraft
,
the
Helios
II
deep
space
probe
,
has
set
a
speed
record
of
70
.
2
____________________
/
s
.
Even
at
that
____________________
,
the
____________________
to
Proxima
Centauri
would
take
18
,
000
years
.
The
proposed
VASIMR
propulsion
system
,
possibly
able
to
achieve
____________________
up
to
300
km
/
s
,
would
shorten
the
____________________
to
a
"
mere
"
4
,
200
years
?
still
firmly
beyond
the
current
lifespan
of
both
man
and
____________________
.
It
follows
that
____________________
travel
would
require
radically
new
____________________
to
become
feasible
.
Requiring
us
to
use
faster
,
larger
and
stronger
____________________
.
