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Science: What breakthroughs will the 2020s bring?

By Clive Cookson
New York Times·
13 mins to read

1. Cosmology and sapace

For cosmologists, the biggest discovery of the next decade would be to find out what our universe is made of. Astronomers who observe the movement and distribution of objects across the cosmos calculate that normal matter — all the galaxies, stars, planets, quasars, black holes and so on whose existence they can detect or deduce — accounts for just 5 per cent of the universe. The missing 95 per cent consists of "dark energy" and "dark

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