I wouldn't call it 'low hanging fruit' but one day we will either find dark matter, or find a new formula for gravity that makes dark matter unnecessary. Either way, once found, it will seem obvious to everyone who comes after.,(reply>), @Hgbnk Bggj If it turns out to be a particle, or a simple change to Newtons law of gravity, it may seem simple to those that come after that discovery. Nothing seems obvious before it is discovered almost by definition. But many things seem obvious after you know the answer. Dark matter is something we will almost certainly know the answer to in the future.,(reply>), Surely dark matter is one of the least obvious subjects? Even if it is identified definitively, it will never be an intuitive subject.