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Articles on Universe

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Where do the hydrogen and oxygen that make up the earth’s water come from? NASA Goddard/Flickr

Why is there water on Earth?

A recent study shows that the Earth's water could come directly from the oxygen and hydrogen present in the rocks that formed it, and not from a late supply by asteroids.
Diligence, technological progress and a little luck have together solved a 20 year mystery of the cosmos. CSIRO/Alex Cherney

Half the matter in the universe was missing – we found it hiding in the cosmos

Cosmologists had only been able to find half the matter that should exist in the universe. With the discovery of a new astronomical phenomenon and new telescopes, researchers just found the rest.
No one knows what kicked off the Big Bang that eventually allowed the stars to begin forming. Adolf Schaller for STScI

How could an explosive Big Bang be the birth of our universe?

The term 'Big Bang' might make you think of a massive explosion. Put the thought out of your head. Rather than an explosion, it was the start of everything in the universe.
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.

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