What is the purpose of 'evolved Laser Interferometer Space Antenna (eLISA)' project?
A
To detect neutrinos
B
To detect gravitational waves
C
To detect the effectiveness of missile defence system
D
To study the effect of solar flares on our communication systems
Correct Answer: Option B
Explanation
1. The 'evolved Laser Interferometer Space Antenna' (eLISA), now known as LISA (Laser Interferometer Space Antenna), is a planned space mission led by the European Space Agency (ESA) with NASA contribution.
2. Its primary scientific objective and purpose is to detect and study low-frequency gravitational waves originating from sources such as merging supermassive black holes, binary systems in our galaxy, and potentially from the early universe.
3. The project involves placing three spacecraft in a triangular formation in space, connected by laser beams, acting as a giant interferometer to measure the minute distortions in spacetime caused by passing gravitational waves.
4. Options (A), (C), and (D) are incorrect. Detecting neutrinos involves different kinds of detectors (like IceCube). Assessing missile defence systems involves military technology. Studying solar flares and their effect on communication systems falls under space weather research.
5. Therefore, the correct purpose of eLISA/LISA is to detect gravitational waves.