An overview of Tau Ceti, a star with inhabitable planets
By: Erin Yorke
In the constellation Cetus, Tau Ceti is a star visible to the naked eye from both hemispheres. The star Tau Ceti has been exciting researchers lately. This star is believed by many to host planets with life-friendly conditions. In a world hoping to discover living...
Astronomers suggest Earth hit by Gamma-ray blast 1,200 years ago
By: Terrence Aym
Life on Earth, while robust, is also fragile. The biosphere can only support higher lifeforms within a very narrow range. Mass extinction events have occurred numerous times in Earth's past and no doubt will happen many more times in the future.Various cataclysmic events happen...
By: Michael Totten
Astronomy is the study of celestial objects, which are objects in the sky, as opposed to terrestrial objects, which are found on Earth. Modern astronomy begins where Earth's atmosphere ends.The Earth-Moon systemEarth has a single moon, the Moon. The Earth and Moon orbit each...
By: Michael Totten
The human eye is extremely sensitive to the sun's light. Even a glance at the sun will cause after-images, as a result of overexposure to strong light. Looking at the sun directly, even for a few seconds, can cause permanent burns to the retina at...
By: Imonikhe Ahimie
In August 2006, the International Astronomical Union (IAU) set out formal definitions as what conditions were required to be met for a celestial body to be considered a planet. Prior to this date, there had been no formal definition as to what was or wasn&rsquo...
Have we set parameters that are too narrow for what constitutes a habitable planet?
By: Steven Mars
In 1961, Frank Drake of the National Astronomy And Ionosphere Center devised a mathematical equation for the number of planets in the Milky Way galaxy that could support life. The equation has several drawbacks, including the difficulty of finding the data. The equation (named after...
Have we set parameters that are too narrow for what constitutes a habitable planet?
By: Eric Puravs
The answer depends on what we are looking for when we look for habitable planets. We could be looking for planets where similar life has developed, planets where any form of life might have developed, or planets where humans could live, perhaps with some terraforming...
In terms of cosmology, what is meant by inflation?
By: Retha Boswell
In cosmology, inflation is a theory expanding upon the standard Big Bang Theory. Inflationary Theory proposes that there was massive, exponential expansion very early in the creation of the universe. Inflation is involved a lot in understanding the first moments the universe existed and accounts...
By: M E Skeel
The Wilkinson Microwave Anisotropy Probe (WMAP) was launched by NASA in June of 2001 to make fundamental measurements of the universe. It was spectacularly successful and the results are now affecting every aspect of cosmology (the study of the universe). Out of this study has...
By: Heather Brennan
The Wilkinson Microwave Anisotropy Probe (WMAP) was launched in June of 2001. At the time, cosmologists hoped it would add to the knowledge gained by the Cosmic Background Explorer (COBE) that had been launched in November of 1989. Little did they know it would revolutionize...

 

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