Besides being fascinating in its own right, such exotic finds are a good test of astronomers’ theories about how planets form. In PH1’s case, its four stars are actually a pair of binaries. Conventional planetary-formation theory holds that worlds condense out of a disc of dust and rubble early in a star’s life. But in this case, “the second binary would sit right at the edge of the protoplanetary disc,” notes Dr Lintott. Computer models suggest that the gravitational influence of the second pair of stars ought to disrupt the disc and prevent the formation of planets. Reality, in this case, disagrees with the models—and that is how science advances.
As we learn more and more about the solar system, the reality-check that our theories have to pass becomes more and more stringent. This is one reason why scientists have a habit of opening up old questions that everybody assumed were settled long ago, and deciding that they weren’t. It doesn’t mean the scientists are incompetent: it demonstrates their willingness to contemplate new evidence and re-examine old conclusion in its light. Science certainly does not claim to get things right, but it has a good record of ruling out ways to get things wrong.
-- The Science of Discworld, Terry Pratchett, Ian Stewart and Jack Cohen
Science certainly does not claim to get things right
Yes, yes it does. Otherwise, what would be the point? There’s an infinity of ways to get things wrong; you don’t want to spend your life catalouging them.
The word “right” (without the use of modifiers such as “exactly”) might sound too weak and easily satisfiable, but I think the idea is the following:
Theories that may seem complete and robust today might be found to be incomplete or wrong in the future. You cannot claim certainty in them, although you can probably claim high confidence under certain conditions.
You can’t ever claim absolute certainty in anything. There’s no 1.0 probability in predictions about the universe. But science can create claims of being “right” as strong and justified as any other known process. Saying “science doesn’t claim to get things right” is false, unless you go on to say “nothing can (correctly) claim to get things right, it’s epistemologically impossible”.
We are certain because we treat it as an axiom (loosely speaking) of our epistemology. We’re as certain of it as we would be of a logical truth. In practice we are fallible and can make mistakes about logical truths. But in theory, they are absolutely certain; they have a higher status than mere beliefs about the universe.
Assigning 1.0 probability to any proposition means you can never update away from that probability, no matter what the evidence. That means there’s a part of your map that isn’t causally entangled with the territory. What we’re certain of is that there shouldn’t be such a part.
Source: The Economist’s “Babbage” blog, in a post on exoplanets
(Of course, science advances when reality agrees with models too.)
Edited to remove “emphasis added” from the quotation, which I had added originally but have since decided against.
-- The Science of Discworld, Terry Pratchett, Ian Stewart and Jack Cohen
Yes, yes it does. Otherwise, what would be the point? There’s an infinity of ways to get things wrong; you don’t want to spend your life catalouging them.
The word “right” (without the use of modifiers such as “exactly”) might sound too weak and easily satisfiable, but I think the idea is the following: Theories that may seem complete and robust today might be found to be incomplete or wrong in the future. You cannot claim certainty in them, although you can probably claim high confidence under certain conditions.
You can’t ever claim absolute certainty in anything. There’s no 1.0 probability in predictions about the universe. But science can create claims of being “right” as strong and justified as any other known process. Saying “science doesn’t claim to get things right” is false, unless you go on to say “nothing can (correctly) claim to get things right, it’s epistemologically impossible”.
but are we 100% CERTAIN there’s no 1.0 probability in predictions about the universe?
We are certain because we treat it as an axiom (loosely speaking) of our epistemology. We’re as certain of it as we would be of a logical truth. In practice we are fallible and can make mistakes about logical truths. But in theory, they are absolutely certain; they have a higher status than mere beliefs about the universe.
Assigning 1.0 probability to any proposition means you can never update away from that probability, no matter what the evidence. That means there’s a part of your map that isn’t causally entangled with the territory. What we’re certain of is that there shouldn’t be such a part.