Questions

In  a  boost  to  its  non-proliferation credentials, India joined the Missile Technology Control Regime (MTCR) at   a   ceremony   in   South   Block. India’s  MTCR  membership  would help in furtherance of international non-proliferation  objectives,  India would  enjoy  full  participation  in organisational  activities,  India  had intensified     efforts     at     gaining membership   of   the   MTCR,   the NSG,   the   Australia   Group   and Wassenaar     Arrangement     since getting  a  waiver  at  the  NSG  in 2008. Membership of these groups would    help    India    trade    more effectively    in    critical    high-tech areas

Sunspots are a magnetic phenomenon on the Sun.

The reason a sunspot appears dark is that they are cooler than the rest of the Sun's surface and also the gas inside the spot where the magnetic field is strongest is only emitting about 1/4 as much light as from the rest of the solar surface. 

The Moon takes about 27.3 days to perform one complete orbit around the Earth.