Yes, <em>radiation</em> sources can be used to power spacecraft and satellites, the lights on ocean buoys, and remote weather stations. They can also be used to generate electrical power for consumers, as is done in a nuclear reactor.
Another name for the interstellar matter that will eventually form a star is a protostar or nebula. It is defined as a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter. It is <span>an interstellar cloud of dust, hydrogen, helium and other ionized gases. </span>
If you multiply m (the unit for wavelength) with 1s (the unit for frequency), you will get m/s, the unit for speed. Now multiply! 25 m/s is your final answer!
<span>The answer is:
PE lost every second = mgh = 1.2x10^6 * 9.81 * 50 = 5.89x10^8J
So, Power = 5.89x10^8W</span>