Dark energy: mysterious cosmic force appears to be weakening, say scientists | Astronomy | The Guardian

Dark energy: mysterious cosmic force appears to be weakening, say scientists | Astronomy | The Guardian: Prof%20Ofer%20Lahav%2C%20an%20astronomer%20at%20University%20College%20London%20and%20Desi%20collaborator%2C%20said%3A%20%u201CIt%u2019s%20fair%20to%20say%20we%20have%20no%20idea%20what%20dark%20matter%20or%20dark%20energy%20is.%20The%20constant%20dark%20energy%20%5Btheory%5D%20is%20already%20sufficiently%20challenging.