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Gravity helps stars to form. UNIMAP / L. Piazzo, La Sapienza – Università di Roma; E. Schisano / G. Li Causi, IAPS/INAF, Italy

Curious Kids: how long has gravity existed?

Gravity exists because the universe is full of ‘stuff’ – here’s how it came to be.
The South Pole Telescope and BICEP telescopes (pictured above) may discover clues that could teach us if there was something else ‘before’ the Big Bang. Dr. Keith Vanderlinde/NSF

Curious Kids: What existed before the Big Bang? Did something have to be there to go boom?

Long ago in the distant past, our entire Universe was microscopic – just like an atom – and obeyed completely different rules of cause and effect.
Captured: approximately 15,000 galaxies (12,000 of which are star-forming) widely distributed in time and space. NASA, ESA, P. Oesch (University of Geneva), and M. Montes (University of New South Wales)

Game-changing resolution: whose name on the laws of physics for an expanding universe?

Astronomers are voting to rename one of the laws of physics. The voting may have far-reaching effects leading to renaming of other laws and giving ‘forgotten’ scientists due credit.
Galaxy history revealed by the Hubble Space Telescope. NASA

What is nothing? Martin Rees Q&A

From a mysterious energy of empty space to parallel universes, cosmology’s view of ‘nothing’ is anything but boring.

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