Milky Way Galaxy Doomed: Collision with Andromeda Pending
Illustration Credit: NASA, ESA, Z. Levay and R. van der Marel (STScI), and A. Mellinger
Will our Milky Way Galaxy collide one day with its larger neighbor, the Andromeda Galaxy?
Most likely, yes. Careful plotting of slight displacements of M31’s stars relative to background galaxies on recent Hubble Space Telescope images indicate that the center of M31 could be on a direct collision course with the center of our home galaxy.
Still, the errors in sideways velocity appear sufficiently large to admit a good chance that the central parts of the two galaxies will miss, slightly, but will become close enough for their outer halos to become gravitationally entangled. Once that happens, the two galaxies will become bound, dance around, and eventually merge to become one large elliptical galaxy — over the next few billion years.
Pictured above is an artist’s illustration of the sky of a world in the distant future when the central parts of each galaxy begin to destroy each other. The exact future of our Milky Way and the entire surrounding Local Group of Galaxies is likely to remain an active topic of research for years to come.
Scientists Flood NASA With 400 Ideas to Explore Red Planet
Scientists have responded in a big way to NASA’s call to help reformulate its Mars robotic exploration strategy, submitting about 400 ideas and Red Planet mission concepts to the space agency.
NASA’s Mars program suffered deep cuts in President Barack Obama’s proposed 2013 budget, which was released in February. In response, NASA pulled out of the European-led ExoMars mission, which aims to launch an orbiter and a rover to the Red Planet in 2016 and 2018, respectively.
The agency also undertook a broad rethink of its Mars strategy, to figure out how best to explore the Red Planet with reduced funding. NASA asked the scientific community for ideas and was expecting to get about 200 proposals at its recent Concepts and Approaches for Mars Exploration Workshop in Houston, officials said.
Instead, twice that many submissions poured in from individuals and teams that included professional researchers, undergraduate and graduate students, NASA centers, federal laboratories, industry and international partner organizations.
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Planet X? New Evidence of an Unseen Planet at Solar System’s Edge
Image: This artist’s conception illustrates a giant planet floating freely without a parent star. Astronomers recently uncovered evidence for such lone worlds, thought to have been booted from developing star systems. The sun may have captured such a planet, which new work shows may reside at the edge of the solar system. Credit: NASA/JPL-Caltech
Warning: Approach Article With Skepticism
A planet four times the size of Earth may be skirting the edges of the solar system beyond Pluto, according to new research. Too distant to be easily spotted by Earth-based telescopes, the unseen planet could be gravitationally tugging on small icy objects past Neptune, helping explain the mystery of those objects’ peculiar orbits.
The claim comes from Rodney Gomes, a noted astronomer at the National Observatory of Brazil in Rio de Janeiro. Gomes presented his recently completed computer models suggesting the existence of the distant planet at a meeting of the American Astronomical Society in Timberline Lodge, Ore., earlier this month.
Astronomers who attended the talk find Gomes’ arguments compelling, but they say much more evidence is needed before the hypothetical planet can be crowned as real.
For several years, astronomers have observed that a handful of the small icy bodies that lie in the so-called “scattered disc” beyond the orbit of the planet Neptune, including the dwarf planet Sedna, deviate from the paths around the sun that would be expected based on the gravitational pulls of all the known objects in the solar system.
Sedna, for example, swings around the sun in an extremely elongated orbit — tracing out a very long oval. “Sedna’s orbit is truly peculiar,” said Mike Brown, an astronomer at Caltech who led the team that discovered Sedna in 2003.
However, when Gomes ran the same calculations with the addition of the gravitational pull of a massive planet at the outskirts of the solar system, Sedna and the other anomalous objects’ expected orbits fell in line with observations. The unseen planet would be too far away to perceptibly perturb the motions of Earth and the other inner planets, but close enough to the scattered disc objects to sway them.
Full Article
Similar Stories: [The True Stories of 5 Mystery Planets]](http://24.media.tumblr.com/tumblr_m4hg1arf3e1qbn5m1o1_400.jpg)
Planet X? New Evidence of an Unseen Planet at Solar System’s Edge
Image: This artist’s conception illustrates a giant planet floating freely without a parent star. Astronomers recently uncovered evidence for such lone worlds, thought to have been booted from developing star systems. The sun may have captured such a planet, which new work shows may reside at the edge of the solar system. Credit: NASA/JPL-Caltech
Warning: Approach Article With Skepticism
A planet four times the size of Earth may be skirting the edges of the solar system beyond Pluto, according to new research. Too distant to be easily spotted by Earth-based telescopes, the unseen planet could be gravitationally tugging on small icy objects past Neptune, helping explain the mystery of those objects’ peculiar orbits.
The claim comes from Rodney Gomes, a noted astronomer at the National Observatory of Brazil in Rio de Janeiro. Gomes presented his recently completed computer models suggesting the existence of the distant planet at a meeting of the American Astronomical Society in Timberline Lodge, Ore., earlier this month.
Astronomers who attended the talk find Gomes’ arguments compelling, but they say much more evidence is needed before the hypothetical planet can be crowned as real.
For several years, astronomers have observed that a handful of the small icy bodies that lie in the so-called “scattered disc” beyond the orbit of the planet Neptune, including the dwarf planet Sedna, deviate from the paths around the sun that would be expected based on the gravitational pulls of all the known objects in the solar system.
Sedna, for example, swings around the sun in an extremely elongated orbit — tracing out a very long oval. “Sedna’s orbit is truly peculiar,” said Mike Brown, an astronomer at Caltech who led the team that discovered Sedna in 2003.
However, when Gomes ran the same calculations with the addition of the gravitational pull of a massive planet at the outskirts of the solar system, Sedna and the other anomalous objects’ expected orbits fell in line with observations. The unseen planet would be too far away to perceptibly perturb the motions of Earth and the other inner planets, but close enough to the scattered disc objects to sway them.
Similar Stories: [The True Stories of 5 Mystery Planets]
Eclipse from Outer Space
by A4size-ska
Note: This is art and NOT an image of the 2012 May 20 eclipse from orbit largely promoted as such via tumblr. Don’t believe everything you read.
NGC 3199 lies about 12,000 light-years away, a glowing cosmic cloud in the southern constellation of Carina. The nebula is about 75 light-years across in this haunting, false-color view.
Though the deep image reveals a more or less complete ring shape, it does look very lopsided with a much brighter edge at the lower right. Near the center of the ring is a Wolf-Rayet star, a massive, hot, short-lived star that generates an intense stellar wind.
