Some experiments are planned to constrain Einstein's general-relativity.
These will be using ESA's EUCLID space-telescope (launching July!) and Arizona's DESI in operation since 2021. DESI is phasing out in 2026; to be replaced (so I gather) by the massive Square Kilometre Array radio project across South Africa and Australia. Assuming South Africa still exists by 2028.
Einstein will be facing off against Euler among whose equations was one to measure galaxy-movements. Up for measurement is the acceleration of the universe and the presence of dark-matter. Or, I suppose, if we need to be using Modified-Newton Dynamics "MOND".
At the same time (kek), another experiment is in the works: NIST's synchonisation. Again this tests Einstein; also - they are promising - dark matter. Why not dark energy too? NIST is designing for lightness on the rule of Every Gram Counts, possibly planning on the Falcon Heavy to bring the experiment up to where they need it which is terrastationary (NIST too vaguely says "geosynchronous").
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