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A primer on the science of global warming

Lifting the curtain on reality

First Look

Congressional Gold Medals to be awarded to Jan. 6 police officers

In Pictures

Space photos of the day: Black Holes

An artist's illustration shows a supermassive black hole, with a center millions to billions times the mass of our sun, surrounded by matter flowing onto what is termed an accretion disk. Supermassive black holes are enormously dense objects buried at the hearts of galaxies. This disk forms as dust and gas in the galaxy falls onto the hole, attracted by its gravity. Also shown in the illustration, which NASA released Feb. 27, 2013, is an outflowing jet of energetic particles, believed to be powered by the black hole's spin.

Our relation to God 鈥� stable and strong

In Pictures

Space photos of the day: Heavenly Rings

This false-color image shows the incredible, complex beauty of Saturn's rings. The massive ring system is over 150,000 miles in diameter.

In Pictures

Space photos of the day: Supernovas

The Crab Nebula, filled with mysterious filaments, is the result of a star that was seen to explode in 1054 AD. This spectacular supernova explosion was recorded by Chinese and (quite probably) Anasazi Indian astronomers. The filaments are mysterious because they appear to have less mass than expelled in the original supernova and higher speed than expected from a free explosion. In the above picture taken recently from a Very Large Telescope, the color indicates what is happening to the electrons in different parts of the Crab Nebula.

Readers Respond

Readers write: War in Ukraine and hope for the high seas

Shuttle's risky mission to repair Hubble

In Pictures

Space photos of the day: Hubble

This image of the core of galaxy M100 shows faint structure as small as 30 light-years across in a galaxy tens of millions of light-years away, made possible by The Hubble Space Telescope's improved optics.

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