BIs it possible to see the history of space if it expands faster than light? I was wondering if it would be possible to see the history of space if one was to stand at the edge of the universe as it expanded faster than the speed of light. If the universe was to be expanding faste...
Two sources of redshift: Doppler and cosmological expansion; modeled after Koupelis & Kuhn. Bottom: Detectors catch the light that is emitted by a central star. This light is stretched, or redshifted, as space expands in between. Credit: Brews Ohare. This is why cosmologists speak of redsh...
The Universe Cools As It Expands Photo: Jiří Bubeníček Wikimedia Commons CC-BY-SA 4.0 By studying molecules in a gas cloud located in a distant galaxy, astronomers in 2013 precisely calculated the rate at which the universe is cooling. Through the use of the CSIRO Australia Telescope ...
The bubbleworld is also constructed very differently, using a large solar array to heat a pocket of water inside of a metal asteroid so that the metal expands. Rotating the asteroid causes the malleable material to form a cylinder, which is then capped off and the water drained. The inside...
What goes faster than the speed of light? Although the speed of light is often referred to as the universe's speed limit, the universe actually expands even faster. The universe expands at a little more than 42 miles (68 kilometers) per second for each megaparsec of distance from the obse...
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This air expands and cools as air pressure decreases, and because this cool air is denser than its surroundings, it then sinks and gets warmed by the Earth again. Above the troposphere, some 30 miles (48 km) above the Earth's surface, is the stratosphere. The still air of the ...
When the solar activity is high, the Earth's atmosphere expands, so what was a safe altitude is suddenly not so safe anymore. NASA found this out the hard way with the Skylab mission. In 1974 it was parked at an altitude of 433 km pericenter by 455 km apocenter. This should have ...
When it expands, its outer layers will consume Mercury and Venus and also reach Earth. Scientists are still debating whether or not our planet will be engulfed, or whether it will orbit dangerously close to the red giant sun. Either way, life, as we know it on Earth, will cease to ...
Two sources of redshift: Doppler and cosmological expansion; modeled after Koupelis & Kuhn. Bottom: Detectors catch the light that is emitted by a central star. This light is stretched, or redshifted, as space expands in between. Credit: Brews Ohare ...