How a single mission prepares us to hear the ripples of space-time
In short: Before we can map the gravitational universe, we must first master the art of extreme precision. The LISA Pathfinder mission serves as a vital technological precursor, testing the delicate instruments required to detect invisible waves traveling across the cosmos.
The LISA Pathfinder mission, launched in early December 2015 via a Vega rocket from Kourou, French Guiana, was designed to validate the technologies necessary for detecting gravitational waves from space [S1]. By proving these instruments can function in a space environment, the mission acts as a precursor to the full LISA mission, which aims to observe a previously undetectable sea of low-frequency gravitational waves [S1, S3:p1]. These waves are essentially ripples in space-time that carry vital data regarding massive cosmic objects and extreme events.
The architecture of the future LISA mission involves three spacecraft flying in a massive triangular formation that follows Earth's orbit around the Sun. Each arm of this triangle spans 1.6 million miles (2.5 million kilometers)—a distance large enough to house the Sun. To detect waves, the spacecraft use laser beams to monitor the distance between two Rubik's-cube-sized, free-floating proof masses located inside each craft. The goal is to identify changes in these distances that are smaller than the diameter of a single hydrogen atom.
To reach such sensitivity, substantial physical obstacles must be addressed, including the accumulation of electrical charge upon the gold-platinum test masses. To address this, NASA is developing charge management devices to maintain the stability of the free-floating cubes. While ground-based observatories like LIGO already detect gravitational waves, the LISA mission—a collaboration between ESA and NASA—will expand our observational window to include complex systems, such as extreme-mass-ratio inspirals, where a stellar-mass black hole orbits a much larger black hole.
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Sources
- Summary by Intellect · source: LISA Pathfinder - Window on the gravitational universe
- Also: Seeing the Universe through gravitational waves - LISA Pathfinder - Science Portal
- Also: LISA - NASA Science
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