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The size and age of the universe, as well as how fast it is expanding, has been confirmed with a new, precise method that uses galaxies as lenses to look at other galaxies. The new measurement confirmed the age of the universe as 13.75 billion years old, to within 170 million years, and also confirmed the strength of dark energy , which is responsible for the accelerating expansion of the universe. When looking out at the cosmos, it can be difficult for scientists to distinguish between a very bright light far away and a dimmer source much closer to Earth. To circumvent this problem, a team of researchers used a technique called gravitational lensing to measure the distances light traveled from a bright, active galaxy to the Earth along different paths, along with data from the Hubble Space Telescope. Researchers can use the observations to infer not just how far away the galaxy lies but also the overall scale of the universe and some details of its expansion.
Galactic Lenses Confirm Universe's Age, Size
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Browse News Stories 1 to 10 of 5,170 stories How to Build a Very Large Star March 27, 2013 — Stars ten times as massive as the Sun, or more, should not exist: as they grow, they tend to push away the gas they feed on, starving their own growth. Scientists have been struggling to figure out ... > full story Astronomers Discover New Kind of Supernova March 26, 2013 — Supernovae were always thought to occur in two main varieties. But a team of astronomers is reporting the discovery of a new type of supernova called Type Iax. Previously, supernovae were divided ... > full story Ash from Refuse Could Become Hydrogen Gas March 25, 2013 — Every year, millions of tons of environmentally harmful ash is produced worldwide, and is mostly dumped in landfill sites or, in some countries, used as construction material.
Space - Astronomy and Exploration
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Read an essay on the greatest science books by Nobel laureate Kary B.