They have never found a force carrier for gravity. The elusive gravitons. Through the Wormhole With Morgan Freeman s1e1: Is There a Creator? Science 2010
Gravity slows time, and this is key to one form of time travel. Through the Wormhole with Morgan Freeman s1e3: Is Time Travel Possible?
We feel it every moment of our lives: but for physicists it is the oldest unsolved mystery in the cosmos. Why does gravity make everything attract? … Could gravity be another force in disguise? Through the Wormhole with Morgan Freeman s5e2: Is Gravity an Illusion?
Gravity is the hardest problem in physics. ibid.
Gravity ... It will accelerate to land at a constant rate of 0.98 meters per second per second. This is a fundamental law on our planet. Professor Marcus du Sautoy, The Code I: Numbers BBC 2011
Guth: Gravity can act in reverse. Professor Brian Greene, Beyond The Cosmos: Multiverse, National Geographic 2012
What if gravity and acceleration are really the same thing? Inside Einstein’s Mind: The Enigma of Space and Time, BBC 2015
What if space/time is shaped by matter? And that’s what we feel as gravity. ibid.
Nash had an idea about ‘gravity, friction and radiation' as he later recalled. The friction he was thinking of was the friction that a particle, say a photon, might encounter as it moved through space due to its fluctuating gravitational field interacting with other gravitational fields. Sylvia Nasar, A Beautiful Mind
It’s the strangest idea in the whole of science. It emerged by accident from bizarre experiments. Scientists resisted it. But a maverick would force them to take it seriously. The idea means we live in a giant bubble. Parallel Universes, National Geographic
Some of the world’s most respected scientists claim these other worlds may actually exist. ibid.
Some exist far beyond the further edge of our visible universe, others hang out in a mysterious landscape full of dark energy called the Multiverse, and others are right here in the same space we are all living, but we can’t see them obviously. ibid.
You might not want to meet your other self. ibid.
[Hugh] Everett wrote what’s become the definitive argument for parallel universes called Many Worlds. ibid.
An infinite number of other realities. ibid.
It sculps the universe. It warps space and time. It’s a fundamental force of nature. Jim Al-Khalili, Gravity and Me: The Force that Shapes Our Lives, BBC 2017
Something fundamental to all falling objects – they accelerate. ibid.
F = G M1 x M2
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R² ibid.
I really have shrunk by just over half an inch over the course of the day. ibid.
You could be forgiven for thinking of gravity as vastly powerful. Indeed every moment of our lives is shaped and defined by gravity. The Entire History of the Universe e10: Why is Gravity So Weak? 2021
It is weaker even than the so-called Weak Force. ibid.
Gravity’s relative weakness has baffled scientists for years. ibid.
The existence of gravitational waves implies that gravity is not simply a force between individual objects but a field that extends through all space and time. ibid.