Question 43
AOptions
BSolution
The description provided – "The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft" – precisely describes the Evolved Laser Interferometer Space Antenna (Evolved LISA) mission. Evolved LISA is a proposed space mission by the European Space Agency (ESA) to detect gravitational waves, particularly those originating from massive black hole mergers or the early universe, that cannot be observed from Earth-based detectors. The three spacecraft will form a giant interferometer in space, using lasers to precisely measure the tiny distortions in spacetime caused by passing gravitational waves. LISA Pathfinder was a precursor mission designed to test the technology required for the full LISA mission, but the description of the large triangular formation with million-kilometer arms refers to the full-scale observatory, Evolved LISA.
CStrategy
For questions involving space missions, specific knowledge of their design, objectives, and key technologies is crucial. Distinguish between precursor missions and the full-scale observatories they enable. Keeping up with major international science projects is beneficial.
DSyllabus Analysis
This question falls under Science & Technology, specifically Space Technology, Astronomy, and the detection of gravitational waves.
EQuestion Analysis
Medium to Difficult. Requires specific knowledge of advanced space missions and their designs, distinguishing between different phases of a mission (like Pathfinder vs. Evolved LISA).