Welcome toAtheist Universe
Sign Upor Sign In
Or sign in with:
We are a worldwide social network of freethinkers, atheists, agnostics and secular humanists.
Give a Gift
Give a Gift
Give a Gift
Donovan W Baker
Give a Gift
Give a Gift
Cosmology Astrophysics Astronomy
Latest Activity: yesterday
Cosmology - Astrophysics - Astronomy
Hubble Wallpaper - Awesome Hubble Images
Started by Tom Sarbeck. Last reply by Joey Daniel Smith Dec 22, 2018.
Started by Mrs.B. Last reply by Mrs.B Apr 9, 2016.
Started by Davy. Last reply by Onyango Makagutu Mar 8, 2016.
Started by Davy Oct 3, 2013.
Started by Davy. Last reply by Davy Aug 15, 2013.
The Last Goodbye
Ask Ethan: Why Did Light Arrive 1.7 Seconds After Gravitational Waves In The Neutron Star Merger?
Five Discoveries In Fundamental Physics That Came As Total Surprises
Even while the world suffers, investing in science is non-negotiable (Synopsis)
Merging Neutron Stars Deliver Deathblow To Dark Matter And Dark Energy Alternatives (Synopsis)
Explanation: Using the prolific planet hunting Kepler spacecraft, astronomers have discovered 1,235 candidate planets orbiting other suns since the Kepler mission's search for Earth-like worlds began in 2009. To find them, Kepler monitors a rich star field to identify planetary transits by the slight dimming of starlight caused by a planet crossing the face of its parent star. In this remarkable illustration, all of Kepler's planet candidates are shown in transit with their parent stars ordered by size from top left to bottom right. Simulated stellar disks and the silhouettes of transiting planets are all shown at the same relative scale, with saturated star colors. Of course, some stars show more than one planet in transit, but you may have to examine the picture at high resolution to spot them all. For reference, the Sun is shown at the same scale, by itself below the top row on the right. In silhouette against the Sun's disk, both Jupiter and Earth are in transit.
From Today's Start with a Bang
The Hyades is out of B-stars, but contains many more A-stars and F-stars than our neighborhood does; it even contains 8 white dwarf stars, which are the corpses of B-stars that weren't quite massive enough to make it to a supernova!
At 625 million years, it's an oldie but a goodie. And at just 151 light-years away, it might be an ideal place to find a young world to colonize someday! But you'd better move fast, because these stars won't stay bound together for long. Why not? Break out your red/green 3-D glasses if you've got them, because you'll want to see this animation.
(Image credit: Alexander Meleg.)
The Hyades are flying apart! Open star clusters don't live very long because, when you get a large number of massive objects together like that, gravitational interactions periodically kick stars out, eventually dissipating the cluster and just leaving a large number of mostly single, binary or trinary star systems. But for right now, there are hundreds of them pretty tightly packed together, including an unusual concentration of stars more massive than our
The detailed Spitzer Space Telescope view above features infrared light from dust (red) and old stars (blue) in Andromeda, a massive spiral galaxy a mere 2.5 million light-years away. In fact, with over twice the diameter of our own Milky Way, Andromeda is the largest nearby galaxy. Andromeda's population of bright young stars define its sweeping spiral arms in visible light images, but here the infrared view clearly follows the lumpy dust lanes heated by the young stars as they wind even closer to the galaxy's core. Constructed to explore Andromeda's infrared brightness and stellar populations, the full mosaic image is composed of about 3,000 individual frames. Two smaller companion galaxies, NGC 205 (below) and M32 (above) are also included in the combined fields. The data confirm that Andromeda (aka M31) houses around 1 trillion stars, compared to 4 hundred billion for the Milky Way.
NASA Spitzer and Chandra Space Telescopes http://chandra.harvard.edu/photo/2000/0007/
Click to see a few hundred small thumbnail images from Hubble Hubble WallPaper - Another AU Page
Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep. The origin of the Valles Marineris remains unknown, although a leading hypothesis holds that it started as a crack billions of years ago as the planet cooled. Several geologic processes have been identified in the canyon. The above mosaic was created from over 100 images of Mars taken by Viking Orbiters in the 1970s.
yet another amazing video from the link off of Radu's page:
i just swiped this awesome video off of Radu's page, fascinating, i smiled all the way from first moment to last:
WOW! Sun Eruption Creates Spectacular Plasma Tentacle
A NASA spacecraft watching the sun has caught a dazzling view of a solar eruption that launched a vast tendril of magnetic plasma into space.
NASA's Solar Dynamics Observatory recorded the sun tentacle, which scientists call a solar prominence, on March 19 as it erupted into space with a rounded, twisting motion.
The eruption occurred over five hours as SDO watched the sun in the ultraviolet range of the light spectrum, SDO mission scientists said in a statement. The solar observatory watched as the prominence twisted up from the sun and expanded, then became unstable. [Video: Round Eruption From the Sun]
Ultimately, the sun filament lost cohesion and its particles streamed away from the sun.
"Prominences are elongated clouds of plasma that hover above the sun's surface, tethered by magnetic forces," SDO mission scientists explained.
The sun is currently in the midst of an active phase of its 11-year solar weather cycle and has kicked up a series of powerful eruptions and flares in recent months. The SDO spacecraft and other space observatories are keeping a close watch on the sun to monitor is solar weather activity. [Amazing Sun Photos from Space]
Earlier this month, the sun unleashed its second X-class solar flare of the year that was aimed at Earth. X-class solar flares are the strongest types of solar flares. The weakest types of solar flares are Class C sun storms, with Class M flares registering as medium strength, but still powerful, NASA scientists have said.
Strong solar flares, when aimed at Earth, can potentially disrupt satellites and power grids, as well as pose a hazard to astronauts on spacecraft. They can also spark dazzling shows of the northern lights, or aurora borealis.
From Starts with a Bang
Except, that is, near the North and South magnetic poles, where those field lines all appear to enter/exit our planet. And whenever the Sun emits a flare, prominence, or other "event," here's what happens.
(Image credit: NASA's Marshall Space Flight Center.)
© 2019 Created by Atheist Universe.
Report an Issue |
Terms of Service
Please check your browser settings or contact your system administrator.