<s>
SpaceEngine	B-Application
is	O
an	O
interactive	O
3D	O
planetarium	O
and	O
astronomy	O
software	O
developed	O
by	O
Russian	O
astronomer	O
and	O
programmer	B-Application
Vladimir	B-Application
Romanyuk	I-Application
.	O
</s>
<s>
SpaceEngine	B-Application
is	O
in	O
beta	O
status	O
and	O
up	O
to	O
version	O
0.9.8.0E	O
,	O
released	O
in	O
August	O
2017	O
,	O
it	O
was	O
and	O
still	O
is	O
available	O
as	O
download	O
for	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Version	O
0.990	O
beta	O
was	O
the	O
first	O
paid	O
edition	O
,	O
released	O
in	O
June	O
2019	O
on	O
Steam	B-Application
.	O
</s>
<s>
The	O
program	O
has	O
full	O
support	O
for	O
VR	B-Device
headsets	I-Device
.	O
</s>
<s>
Properties	O
of	O
objects	O
,	O
such	O
as	O
temperature	O
,	O
mass	O
,	O
radius	B-Protocol
,	O
spectrum	O
,	O
etc.	O
,	O
are	O
presented	O
to	O
the	O
user	O
on	O
the	O
HUD	O
and	O
in	O
an	O
accessible	O
information	O
window	O
.	O
</s>
<s>
Users	O
can	O
observe	O
celestial	O
objects	O
ranging	O
from	O
small	O
asteroids	O
or	O
moons	O
to	O
large	O
galaxy	B-Application
clusters	O
,	O
akin	O
to	O
other	O
simulators	O
such	O
as	O
Celestia	B-Application
,	O
OpenSpace	O
,	O
Gaia	B-Application
Sky	I-Application
,	O
and	O
Nightshade	B-Application
NG	I-Application
.	O
</s>
<s>
The	O
default	O
version	O
of	O
SpaceEngine	B-Application
includes	O
over	O
130,000	O
real	O
objects	O
,	O
including	O
stars	O
from	O
the	O
Hipparcos	O
catalog	O
,	O
galaxies	B-Application
from	O
the	O
NGC	O
and	O
IC	O
catalogs	O
,	O
many	O
well-known	O
nebulae	O
,	O
and	O
all	O
known	O
exoplanets	O
and	O
their	O
stars	O
.	O
</s>
<s>
The	O
proclaimed	O
goal	O
of	O
SpaceEngine	B-Application
is	O
scientific	O
realism	O
,	O
and	O
to	O
reproduce	O
every	O
type	O
of	O
known	O
astronomical	O
phenomenon	O
.	O
</s>
<s>
It	O
uses	O
star	O
catalogs	O
along	O
with	O
procedural	O
generation	O
to	O
create	O
a	O
cubical	O
universe	O
10	O
billion	O
parsecs	B-Language
(	O
32.6	O
billion	O
light-years	O
)	O
on	O
each	O
side	O
,	O
centered	O
on	O
the	O
barycenter	O
of	O
the	O
Solar	O
System	O
.	O
</s>
<s>
SpaceEngine	B-Application
also	O
has	O
a	O
built-in	O
flight	O
simulator	O
(	O
currently	O
in	O
Alpha	O
)	O
which	O
allows	O
for	O
users	O
to	O
spawn	O
in	O
a	O
selection	O
of	O
fictional	O
spacecraft	O
which	O
can	O
be	O
flown	O
in	O
an	O
accurate	O
model	O
of	O
orbital	O
mechanics	O
and	O
also	O
an	O
atmospheric	O
flight	O
model	O
when	O
entering	O
the	O
atmospheres	O
of	O
the	O
various	O
planets	O
and	O
moons	O
.	O
</s>
<s>
The	O
real	O
objects	O
that	O
SpaceEngine	B-Application
includes	O
are	O
the	O
Hipparcos	O
catalog	O
for	O
stars	O
,	O
the	O
NGC	O
and	O
IC	O
catalogs	O
for	O
galaxies	B-Application
,	O
all	O
known	O
exoplanets	O
,	O
and	O
prominent	O
star	O
clusters	O
,	O
nebulae	O
,	O
and	O
Solar	O
System	O
objects	O
including	O
some	O
comets	B-Language
and	O
asteroids	O
.	O
</s>
<s>
The	O
software	O
has	O
its	O
own	O
built-in	O
"	O
wiki	B-Protocol
"	O
database	O
which	O
gives	O
detailed	O
information	O
on	O
all	O
celestial	O
objects	O
and	O
enables	O
a	O
player	O
to	O
create	O
custom	O
names	O
and	O
descriptions	O
for	O
them	O
.	O
</s>
<s>
SpaceEngine	B-Application
has	O
a	O
fairly	O
large	O
modding	O
community	O
dedicated	O
to	O
expanding	O
on	O
the	O
program	O
's	O
current	O
catalogues	O
,	O
improving	O
things	O
like	O
texture	O
quality	O
,	O
and	O
even	O
improving	O
the	O
program	O
's	O
terrain	O
and	O
cloud	O
generation	O
as	O
a	O
whole	O
(	O
See	O
)	O
.	O
</s>
<s>
Although	O
objects	O
that	O
form	O
part	O
of	O
a	O
planetary	O
system	O
move	O
,	O
and	O
stars	O
rotate	O
about	O
their	O
axes	O
and	O
orbit	B-Application
each	O
other	O
in	O
multiple	O
star	O
systems	O
,	O
stellar	O
proper	O
motion	O
is	O
not	O
simulated	O
,	O
and	O
galaxies	B-Application
are	O
at	O
fixed	O
locations	O
and	O
do	O
not	O
rotate	O
.	O
</s>
<s>
Most	O
real-world	O
spacecraft	O
such	O
as	O
Voyager	O
2	O
are	O
not	O
provided	O
with	O
SpaceEngine	B-Application
.	O
</s>
<s>
Interstellar	O
light	O
absorption	O
is	O
not	O
modeled	O
in	O
SpaceEngine	B-Application
.	O
</s>
<s>
Intrinsic	O
variable	O
stars	O
are	O
not	O
supported	O
by	O
SpaceEngine	B-Application
.	O
</s>
<s>
Gravity	O
is	O
not	O
simulated	O
in	O
SpaceEngine	B-Application
,	O
with	O
the	O
exception	O
of	O
the	O
controllable	O
spacecraft	O
.	O
</s>
<s>
SpaceEngine	B-Application
's	O
procedural	O
generation	O
algorithms	O
are	O
not	O
100%	O
scientifically	O
accurate	O
,	O
and	O
can	O
sometimes	O
churn	O
out	O
unrealistic	O
results	O
.	O
</s>
<s>
SpaceEngine	B-Application
's	O
development	O
team	O
does	O
fix	O
,	O
or	O
at	O
least	O
attempt	O
to	O
fix	O
,	O
these	O
issues	O
when	O
they	O
arise	O
,	O
and	O
are	O
oftentimes	O
successful	O
.	O
</s>
<s>
There	O
is	O
a	O
current	O
bug	O
in	O
the	O
procedural	O
planet	O
order	O
generation	O
in	O
star	O
systems	O
in	O
SpaceEngine	B-Application
that	O
is	O
often	O
called	O
the	O
"	O
terra-gas	O
giant	O
"	O
bug	O
or	O
the	O
"	O
procedural	O
planet	O
order	O
generation	O
bug	O
"	O
,	O
which	O
is	O
a	O
bug	O
that	O
makes	O
almost	O
all	O
star	O
systems	O
in	O
SpaceEngine	B-Application
have	O
a	O
planet	O
order	O
pattern	O
of	O
terrestrial	O
planet	O
,	O
gas	O
giant	O
,	O
terrestrial	O
planet	O
,	O
gas	O
giant	O
.	O
</s>
<s>
The	O
bug	O
has	O
been	O
present	O
in	O
all	O
versions	O
of	O
SpaceEngine	B-Application
,	O
and	O
the	O
development	O
team	O
has	O
said	O
that	O
they	O
will	O
try	O
to	O
fix	O
it	O
in	O
the	O
future	O
.	O
</s>
<s>
Ultimately	O
,	O
these	O
limitations	O
are	O
a	O
result	O
of	O
the	O
algorithmic	O
nature	O
of	O
SpaceEngine	B-Application
's	O
procedural	O
generation	O
,	O
since	O
it	O
is	O
extremely	O
hard	O
,	O
if	O
not	O
impossible	O
,	O
to	O
make	O
these	O
algorithms	O
100%	O
scientifically	O
accurate	O
.	O
</s>
<s>
Development	O
of	O
SpaceEngine	B-Application
began	O
in	O
2005	O
,	O
with	O
its	O
first	O
public	O
release	O
in	O
June	O
2010	O
.	O
</s>
<s>
The	O
software	O
is	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
The	O
engine	O
uses	O
OpenGL	B-Application
as	O
its	O
graphical	O
API	B-General_Concept
and	O
uses	O
shaders	O
written	O
in	O
GLSL	B-Language
.	O
</s>
<s>
On	O
May	O
27	O
,	O
2019	O
,	O
the	O
Steam	B-Application
store	I-Application
page	O
for	O
SpaceEngine	B-Application
was	O
made	O
public	O
in	O
preparation	O
for	O
the	O
release	O
of	O
the	O
first	O
paid	O
version	O
,	O
0.990	O
beta	O
.	O
</s>
<s>
SpaceEngine	B-Application
is	O
currently	O
only	O
available	O
for	O
Windows	B-Application
PCs	I-Application
;	O
however	O
,	O
there	O
is	O
plans	O
for	O
the	O
software	O
to	O
support	O
macOS	B-Application
and	O
Linux	B-Application
in	O
the	O
future	O
.	O
</s>
<s>
Even	O
though	O
SpaceEngine	B-Application
only	O
natively	O
supports	O
Windows	O
,	O
the	O
Steam	B-Application
version	O
can	O
be	O
run	O
on	O
Linux	B-Application
via	O
Steam	B-Application
's	O
Proton	B-Application
compatibility	O
tool	O
.	O
</s>
