Harvard scientist ain't what they used to be.
Lots of high odds and low odds competing in a nearly infinite universe.
High odds that we're not the only intelligent life in the universe.
Extremely low odds that we'll ever find other intelligent life in the universe - because of its vastness in both space and time. We might be the only intelligent life in the universe at the moment. Many, many civilizations could have risen and fallen to dust in the 14 billion year life of the universe to date.
It also appears that a very high confluence of specific things needs to occur for intelligent life - and having a single satellite orbiting a planet - thus creating tides - may be one of the very specific things needed.
The speed of light does appear to be the ultimate speed limit of the universe; if some culture had conquered that speed limit in the past, it's highly doubtful we'd even be here today.
The arguments made by the authors in the OP's link were debunked three years ago, at the time of the sighting.
Link them so we can see whether they have merit or not.
The rest of the post is interesting, except for missing wormholes, also called Einstein-Rosen bridges.
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Cotton1 (01-24-2021)
That was an interesting article. Thanks for the share
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Peter1469 (01-24-2021)
https://authors.library.caltech.edu/...1907.01910.pdf Page 8.
Wormholes might break the "speed limit" of light, but if they exist, they're either random, meaning none anywhere near us, or able to be manipulated by a superior technology, meaning we're damn lucky we haven't been discovered.