Ayush kumar

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The Quantum Universe


Rotating Galaxies Could Prove Dark Matter Wrong

One point of evidence in support of dark matter is the way in which the speed of stars, gas and dust in a galaxy varies with their distance from the center of the galaxy, known as the galactic rotation curve. Most of the visible matter of a galaxy is concentrated near the center of a galaxy, so we …

APOD: Orion and Aurora over Iceland (2014 Mar 24) Image Credit & Copyright: Þorvarður Árnason http://apod.nasa.gov/apod/ap140324.html Explanation: If you see a sky like this -- photograph it. A month ago in Iceland, an adventurous photographer chanced across a sky full of aurora and did just that. In the foreground lies the stratovolcano Öræfajökull. In the background, among other sky delights, lies the constellation of Orion, visible to the aurora's left. Auroras are sparked by energetic particles from the Sun impacting the magnetic environment around the Earth. Resultant energetic particles such as electrons and protons rain down near the Earth's poles and impact the air. The impacted air molecules obtain excited electrons, and when electrons in oxygen molecules fall back to their ground state, they emit green light. Auroras are known to have many shapes and colors. http://www.thorri.is/ http://facebook.com/ThorriPhotoFilm/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140324 #APOD

Do Small Satellites Make For More Space Junk?

It depends on how they're deployed.<p>Over the past 15 years, we've been sprinkling space with eensy satellites. Universities, startups and national space programs have all launched fit-in-your-hand satellites that, variously, study life in space, flash Morse code and snap smartphone photos. This …

APOD: The View Near a Black Hole (2014 Mar 23) Illustration Credit: April Hobart, CXC, NASA http://apod.nasa.gov/apod/ap140323.html Explanation: In the center of a swirling whirlpool of hot gas is likely a beast that has never been seen directly: a black hole. Studies of the bright light emitted by the swirling gas frequently indicate not only that a black hole is present, but also likely attributes. The gas surrounding GRO J1655-40, for example, has been found to display an unusual flickering at a rate of 450 times a second. Given a previous mass estimate for the central object of seven times the mass of our Sun, the rate of the fast flickering can be explained by a black hole that is rotating very rapidly. What physical mechanisms actually cause the flickering -- and a slower quasi-periodic oscillation (QPO) -- in accretion disks surrounding black holes and neutron stars remains a topic of much research. http://chandra.harvard.edu/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140323 #APOD

Scientists Baffled by Mysterious Force Tossing Stars Out of Our Galaxy

Something is hitting stars in our Milky Way galaxy with such force that they are reaching the million-plus mile-per-hour velocity needed to break …


APOD: The Antennae Galaxies in Collision (2014 Mar 16) Image Credit: Hubble Legacy Archive, NASA, ESA; Processing & Copyright: Davide Coverta http://apod.nasa.gov/apod/ap140316.html Explanation: Two galaxies are squaring off in Corvus and here are the latest pictures. When two galaxies collide, the stars that compose them usually do not. That's because galaxies are mostly empty space and, however bright, stars only take up only a small amount of that space. During the slow, hundred million year collision, one galaxy can still rip the other apart gravitationally, and dust and gas common to both galaxies does collide. In this clash of the titans, dark dust pillars mark massive molecular clouds are being compressed during the galactic encounter, causing the rapid birth of millions of stars, some of which are gravitationally bound together in massive star clusters. http://hla.stsci.edu/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140316 #APOD

The Avengers... as cats. Because, you know, the internet.

10 Mind-Bending Implications of the Many Worlds Theory

In quantum physics—the scientific study of the nature of physical reality—there is plenty of room for interpretation within the realm of what is …