k-4

♤ K-4 is an intermediate-range nuclear-capable submarine-launched ballistic missile under development by DRDO of India to arm the Arihant class submarine and to complement K-15 Sagarika. The missile has an effective range of 3500 km

1Gliese 581 g was asked in CSE Mains 2011. It was also suspected to be in habitable zone.