✓ NASAScience & Systems
Why passing gravitational waves make every star appear to move
A NASA concept would detect gravitational waves by measuring the tiny coordinated apparent shift they cause in all stars' positions.
When a gravitational wave passes Earth, every star in the sky appears to shift position slightly and in sync, a distortion called the astrometric signature. No single telescope is precise enough to detect it.
A NASA-funded concept by Brookhaven physicist Paul Stankus uses multiple independent spacecraft whose cross-referenced measurements could isolate this signal. This aims to access low-frequency gravitational waves that existing methods cannot detect.
- Astrometric signature
- Phenomenon detected
- Paul Stankus, Brookhaven
- Researcher
- Micro-Hz to nano-Hz
- Frequency target
- Two modest-sized, free-fall orbit
- Spacecraft count
Why it mattersA new low-frequency gravitational wave detection method would open a cosmic observing window that no existing instrument can access.
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