<s>
Sun	B-Device
Constellation	I-Device
System	I-Device
is	O
an	O
open	O
petascale	B-General_Concept
computing	I-General_Concept
environment	O
introduced	O
by	O
Sun	O
Microsystems	O
in	O
2007	O
.	O
</s>
<s>
Ranger	O
was	O
the	O
7th	O
most	O
powerful	O
TOP500	B-Operating_System
supercomputer	O
in	O
the	O
world	O
at	O
the	O
time	O
of	O
its	O
introduction	O
.	O
</s>
