Articles on Gravity

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The universe is home to a dizzying number of stars and planets. But the vast bulk of the universe is thought to be invisible dark matter. Illustris Collaboration

Why do astronomers believe in dark matter?

Why do astronomers believe there's dark matter when it cannot be directly detected? Let's look at the evidence, and see what dark matter's presence means for our 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.
Canadian Space Agency astronaut Chris Hadfield on the International Space Station in 2012. NASA

What happens to the brain in zero gravity?

New research has uncovered exactly what happens to the brain when astronauts are in space.
An artist’s impression of the path of star S2 as it passes very close to the supermassive black hole at the centre of the Milky Way. The very strong gravitational field causes the colour of the star to shift slightly to the red. (Size and colour exaggerated for clarity.) ESO/M. Kornmesser

Einstein’s theory of gravity tested by a star speeding past a supermassive black hole

Astronomers traced a single star as it passed close to the black hole at the centre of our galaxy, and detected the telltale signature of Einstein’s gravity in action.

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