Mapping the different path lengths is going to be one of the ways that we actually figure out what dark energy is. And so you can actually map the expansion history of the universe by getting those distances. One of the ways we might be able to figure out the way that the universe is accelerating.
Can we use gravitational lensing to view distant planets? Neil deGrasse Tyson and comedian Chuck Nice explore black holes, quasars, entropy, and more with astrophysicist and host of PBS Space Time, Matt O’Dowd.
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Photo Credit: NOIRLab/NSF/AURA/J. da Silva, CC BY 4.0, via Wikimedia Commons
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