For the first time in human history, a fragment of the planet Mercury has been identified.
The fragment, delivered to Earth following an impact on Mercury’s surface, is on view at the Yale Peabody Museum of Natural History. Read more →
ISS101: “After Zarya’s launch, the ISS quickly grew and became a place in space where humans live and work.”
Photo Credit : ISS101
CARL SAGAN: a personal voyage. Happy (belated) carl sagan day! For a school biography comic project because spaaace.
ESA ScienceVerified account@esascience
Here’s the scene from SOHO at 07:18UT this morning. #ISON http://ow.ly/rhMgU pic.twitter.com/ZmAUvqyZzU
“Mathematics, rightly viewed, possesses not only truth, but supreme beauty — a beauty cold and austere, without the gorgeous trappings of painting or music." | Betrand Russell
The color of the Aurora depends on the altitude and the atom being struck by solar radiation (causing excitation). At higher altitudes, there is more Atomic Oxygen than Nitrogen, leading to the common color stratifications you see.
500-200 km altitude
— Atomic Oxygen — Red
— Atomic Oxygen — Greenish-Yellow
— Ionized Nitrogen — Blue/Purple
— Nitrogen (N2) — Crimson
Oxygen only emits red at higher altitudes because once it’s excited, it takes a longer time to emit red than it does green. Why is that important? Well, at lower altitudes there is more Nitrogen for the Oxygen to bump into and absorb that excitation-energy before it gets a chance to emit red light. In this case, where the collision occurs, the Oxygen will emit Green and at low enough altitudes the Nitrogen-Oxygen collisions eventually prevent Oxygen from emitting any light at all.
During stronger storms, high energy solar particles will reach lower in the atmosphere and cause the Crimson emission from Nitrogen, creating a deep-red band at the lower edge of the aurora. Other elements emit light too, like Hydrogen (Blue) or Helium (Purple) which are at higher altitudes.
Starless Nebula NGC6188 in Narrowband by Fred Vanderhaven
NGC 6188 is an emission nebula located about 4,000 light years away in the constellation Ara. The bright open cluster NGC 6193, visible to the naked eye, is responsible for a region of reflection nebulosity within NGC 6188.
Comet ISON appeared in the higher-resolution HI-1 camera on NASA’s STEREO-A spacecraft. Dark “clouds” coming from the right are more dense areas in the solar wind, causing ripples in Comet Encke’s tail. Using comet tails as tracers can provide valuable data about solar wind conditions near the sun.
Image Credit: Karl Battams/NASA/STEREO/CIOC, via NASA.gov
Saturn’s two-faced moon tilts and rotates for Cassini in this mesmerizing movie sequence of images acquired during the spacecraft’s close encounter with Iapetus on November 12, 2005.
The encounter begins with Cassini about 850,000 kilometers (530,000 miles) distant from Iapetus. Cassini approached over the moon’s northern hemisphere, allowing for excellent full views of a 575-kilometer (360-mile) wide impact basin in northeastern Cassini Regio. Astronomer Giovanni Cassini discovered the light/dark dichotomy of Iapetus’ two hemispheres (among his other Saturn discoveries), and the dark region – as well as the spacecraft – bears his name.
Credit: NASA/JPL/Space Science Institute
150 Million Degrees: A Fusion Reactor Walkthrough
A fusion reaction is the same reaction that fuels the stars. An international collaboration of scientists hope to someday create our own fusion energy, starting with the prototype ITER fusion reactor, which you can see in this video.
via Live Science Videos.
Hybrid solar eclipse of 2013 november 3 as seen from Pokwero (Uganda).
Double diamond ring at the start of the total phase.
Nikon D7000 + catadioptric MTO 700mm focal lenght, f/7, exposure 1/250 at 200 ISO.
Elemental is an elegant re-design of the Periodic Table of the Elements by Joseph Perry
Perry on his project:
Circular interpretation of the classic Periodic Table, 1869. The print was inspired by my love of both crisp, modern infographics and my every-growing collection of vintage science ephemera. The table is designed to be read from the centre outwards in a clockwise rotation whilst still preserving the function of Mendeleev’s original beauty.