<s>
Orbiter	B-Language
is	O
a	O
space	O
flight	O
simulator	O
program	O
developed	O
to	O
simulate	O
spaceflight	O
using	O
realistic	O
Newtonian	O
physics	O
.	O
</s>
<s>
The	O
simulator	O
was	O
released	O
on	O
27	O
November	O
2000	O
;	O
the	O
latest	O
edition	O
,	O
labeled	O
"	O
Orbiter	B-Language
2016	I-Language
"	O
,	O
was	O
released	O
on	O
30	O
August	O
2016	O
,	O
the	O
first	O
new	O
version	O
of	O
the	O
simulator	O
since	O
2010	O
.	O
</s>
<s>
On	O
27	O
July	O
2021	O
,	O
Dr	O
Schweiger	O
announced	O
to	O
the	O
Orbiter	B-Language
Community	O
that	O
Orbiter	B-Language
is	O
being	O
published	O
under	O
open	O
source	O
MIT	B-License
license	I-License
.	O
</s>
<s>
Orbiter	B-Language
was	O
developed	O
by	O
Martin	B-Language
Schweiger	I-Language
,	O
a	O
senior	O
research	O
fellow	O
in	O
the	O
computer	O
science	O
department	O
at	O
University	O
College	O
London	O
,	O
who	O
felt	O
that	O
space	O
flight	O
simulators	O
at	O
the	O
time	O
were	O
lacking	O
in	O
realistic	O
physics-based	O
flight	O
models	O
,	O
and	O
decided	O
to	O
write	O
a	O
simulator	O
that	O
made	O
learning	O
physics	O
concepts	O
enjoyable	O
.	O
</s>
<s>
Orbiter	B-Language
is	O
a	O
realistic	O
physics	O
simulator	O
which	O
allows	O
users	O
to	O
explore	O
the	O
Solar	O
System	O
in	O
a	O
number	O
of	O
spacecraft	O
,	O
both	O
realistic	O
,	O
such	O
as	O
the	O
;	O
and	O
fictional	O
,	O
such	O
as	O
the	O
"	O
Delta-Glider.	O
"	O
</s>
<s>
Docking	O
and	O
attachment	O
systems	O
allow	O
the	O
user	O
to	O
simulate	O
docking	O
with	O
a	O
space	O
station	O
or	O
other	O
spacecraft	O
,	O
and	O
rendezvous	O
with	O
and	O
retrieval	O
of	O
satellites	B-Application
.	O
</s>
<s>
The	O
Solar	O
System	O
as	O
presented	O
in	O
Orbiter	B-Language
consists	O
of	O
the	O
Sun	O
,	O
the	O
eight	O
planets	O
and	O
their	O
major	O
moons	O
.	O
</s>
<s>
Many	O
dwarf	O
planets	O
,	O
asteroids	O
(	O
except	O
Vesta	O
)	O
,	O
and	O
comets	B-Language
not	O
included	O
in	O
the	O
simulator	O
are	O
available	O
as	O
add-ons	O
.	O
</s>
<s>
Although	O
Orbiter	B-Language
contains	O
a	O
database	O
of	O
over	O
100,000	O
stars	O
,	O
these	O
are	O
for	O
display	O
purposes	O
only	O
and	O
interstellar	O
travel	O
is	O
currently	O
not	O
possible	O
in	O
the	O
simulator	O
.	O
</s>
<s>
The	O
traditional	O
simulated	O
control	O
interface	O
in	O
Orbiter	B-Language
consists	O
of	O
two	O
multi-function	B-Device
displays	I-Device
and	O
a	O
head-up	B-Application
display	I-Application
.	O
</s>
<s>
Each	O
features	O
several	O
modes	O
of	O
operation	O
,	O
with	O
all	O
commands	O
given	O
via	O
the	O
keyboard	B-Device
or	O
mouse	O
.	O
</s>
<s>
Since	O
Orbiter	B-Language
2006	I-Language
Patch	O
1	O
,	O
it	O
has	O
supported	O
TrackIR	B-Operating_System
,	O
which	O
allows	O
the	O
simulator	O
to	O
track	O
the	O
head-movements	O
of	O
the	O
player	O
and	O
adjust	O
the	O
view	O
accordingly	O
.	O
</s>
<s>
Orbiter	B-Language
was	O
developed	O
as	O
a	O
simulator	O
,	O
with	O
accurately	O
modeled	O
planetary	O
motion	O
,	O
gravitation	O
effects	O
(	O
including	O
non-spherical	O
gravity	O
)	O
,	O
free	O
space	O
,	O
atmospheric	O
flight	O
and	O
orbital	O
decay	O
.	O
</s>
<s>
The	O
default	O
version	O
of	O
Orbiter	B-Language
has	O
no	O
sound	O
,	O
however	O
popular	O
add-ons	O
called	O
OrbiterSound	O
and	O
XRSound	O
are	O
available	O
.	O
</s>
<s>
Since	O
Orbiter	B-Language
2016	I-Language
,	O
terrain	O
elevation	O
is	O
modeled	O
for	O
Earth	O
,	O
the	O
Moon	O
,	O
and	O
Mars	O
.	O
</s>
<s>
Orbiters	B-Language
standard	O
distribution	O
includes	O
real	O
and	O
fictional	O
spacecraft	O
and	O
space	O
stations	O
:	O
</s>
<s>
The	O
Orbiter	B-Language
version	O
of	O
the	O
Space	O
Shuttle	O
Atlantis	O
,	O
a	O
retired	O
Space	O
Shuttle	O
orbiter	B-Language
formerly	O
operated	O
by	O
NASA	O
,	O
and	O
the	O
only	O
player-controllable	O
spacecraft	O
based	O
on	O
a	O
real	O
world	O
design	O
that	O
is	O
included	O
with	O
the	O
basic	O
installation	O
of	O
Orbiter	B-Language
.	O
</s>
<s>
Space	O
Station	O
Mir	B-Device
Orbiters	B-Language
model	O
of	O
the	O
historic	O
Russian	O
space	O
station	O
.	O
</s>
<s>
This	O
was	O
done	O
initially	O
to	O
make	O
Mir	B-Device
a	O
good	O
origin	O
of	O
interplanetary	O
flights	O
in	O
earlier	O
versions	O
of	O
Orbiter	B-Language
,	O
when	O
Orbiter	B-Language
also	O
automatically	O
refueled	O
spacecraft	O
on	O
docking	O
with	O
a	O
space	O
station	O
.	O
</s>
<s>
However	O
,	O
it	O
is	O
possible	O
to	O
move	O
Mir	B-Device
into	O
the	O
correct	O
orbit	O
.	O
</s>
<s>
International	O
Space	O
StationIn	O
a	O
similar	O
orbit	O
as	O
the	O
real	O
ISS	B-Device
and	O
in	O
a	O
completed	O
state	O
,	O
it	O
shows	O
modules	O
which	O
are	O
no	O
longer	O
planned	O
to	O
be	O
installed	O
on	O
the	O
real	O
ISS	B-Device
.	O
</s>
<s>
Hubble	O
Space	O
Telescope	O
(	O
HST	O
)	O
A	O
model	O
of	O
the	O
real	O
HST	O
,	O
it	O
gets	O
used	O
together	O
with	O
Orbiter'''s	O
Space	O
Shuttle	O
Atlantis	O
.	O
</s>
<s>
Long	O
Duration	O
Exposure	O
Facility	O
(	O
LDEF	O
)	O
Satellite	B-Application
Like	O
the	O
Hubble	O
Space	O
Telescope	O
,	O
it	O
's	O
one	O
of	O
the	O
example	O
payloads	O
for	O
Orbiters	B-Language
Space	O
Shuttle	O
.	O
</s>
<s>
Delta-Glider	O
(	O
DG	O
)	O
A	O
delta	O
wing	O
spaceplane	O
,	O
which	O
is	O
rather	O
easy	O
to	O
fly	O
and	O
thus	O
good	O
for	O
the	O
first	O
steps	O
into	O
Orbiter	B-Language
.	O
</s>
<s>
Shuttle-A	B-Language
A	O
small	O
space	O
freighter	O
,	O
which	O
can	O
transport	O
six	O
large	O
cargo	O
containers	O
with	O
a	O
total	O
mass	O
of	O
.	O
</s>
<s>
As	O
its	O
main	O
purpose	O
is	O
to	O
serve	O
as	O
simple	O
SDK	B-Application
example	O
for	O
add-on	O
developers	O
,	O
it	O
lacks	O
many	O
complex	O
details	O
of	O
other	O
included	O
ships	O
in	O
Orbiter	B-Language
like	O
2D	O
or	O
3D	O
cockpits	O
or	O
animations	O
.	O
</s>
<s>
It	O
simulates	O
its	O
various	O
subsystems	O
at	O
a	O
higher	O
complexity	O
than	O
all	O
other	O
standard	O
spacecraft	O
in	O
Orbiter	B-Language
,	O
being	O
a	O
good	O
example	O
of	O
the	O
technical	O
possibilities	O
of	O
Orbiters	B-Language
SDK	B-Application
.	O
</s>
<s>
Carina	O
A	O
small	O
fictional	O
science	O
satellite	B-Application
,	O
which	O
is	O
used	O
as	O
payload	O
on	O
Orbiter	B-Language
's	O
Space	O
Shuttle	O
.	O
</s>
<s>
An	O
extensive	O
API	B-General_Concept
enables	O
Orbiter	B-Language
users	O
to	O
contribute	O
by	O
creating	O
add-ons	O
.	O
</s>
<s>
Another	O
popular	O
category	O
of	O
add-ons	O
are	O
modifications	O
of	O
the	O
standard	O
spacecraft	O
of	O
Orbiter	B-Language
,	O
ranging	O
from	O
simple	O
visual	O
changes	O
to	O
complex	O
simulations	O
of	O
the	O
internal	O
subsystems	O
of	O
these	O
fictional	O
crafts	O
.	O
</s>
<s>
Add-ons	O
are	O
also	O
available	O
for	O
new	O
surface	O
bases	O
,	O
MFD	B-Device
modes	O
,	O
extensions	O
of	O
the	O
simulation	O
menu	O
,	O
space	O
stations	O
,	O
planets	O
,	O
and	O
even	O
other	O
planetary	O
systems	O
.	O
</s>
