The Antennae galaxies, located about 62 million light years from Earth, are shown in this composite image from the Chandra X-ray Observatory (blue), the Hubble Space Telescope (gold), and the Spitzer Space Telescope (red).The collision, which began more than 100 million years ago and is still occurring, has triggered the formation of millions of stars in clouds of dusts and gas in the galaxies. The most massive of these young stars have already sped through their evolution in a few million years and exploded as supernovas. X-ray: NASA/CXC/SAO/J.DePasquale; IR: NASA/JPL-Caltech; Optical: NASA/STScI
Robonaut 2, a dexterous, humanoid astronaut helper, will fly to the International Space Station aboard space shuttle Discovery on the STS-133 mission. Although it will initially only participate in operational tests, upgrades could eventually allow the robot to realize its true purpose: helping spacewalking astronauts with tasks outside the space station. NASA
Japan Aerospace Exploration Agency astronaut Soichi Noguchi, Expedition 23 flight engineer, photographed the Mississippi Delta showing the oil slick in the Gulf of Mexico on May 4, 2010. Part of the river delta and nearby Louisiana coast appear dark in the sunglint. This phenomenon is caused by sunlight reflecting off the water surface, in a mirror-like manner, directly back towards the astronaut observer onboard the International Space Station (ISS). NASA
Jupiter's Great Red Spot is seen in this photograph taken by the Voyager 1 probe in 1982. NASA
The air flow from the wing of this agricultural plane is made by a technique that uses colored smoke rising from the ground. Because of wake vortex, the Federal Aviation Administration (FAA) requires aircraft to maintain set distances behind each other when they land. A joint NASA-FAA program aimed at boosting airport capacity, however, is aimed at determining conditions under which planes may fly closer together. NASA
What's lighting up nebula IRAS 05437+2502? No one is sure. Particularly enigmatic is the bright upside-down V that defines the upper edge of this floating mountain of interstellar dust, visible near the image center. One hypothesis holds that the glowing arc was created by a massive star that somehow attained a high velocity and has now left the nebula. ESA/Hubble/NASA
What's causing those strange dark streaks in the rings of Saturn? The moon Prometheus is involved in an orbital dance, creating unusual light and dark streamers in the F-Ring of Saturn. Now Prometheus orbits Saturn just inside the thin F-ring, but ventures into its inner edge about every 15 hours. NASA/Cassini
This false-color photograph of Neptune was made from Voyager 2 images taken through three filters: blue, green, and a filter that passes light at a wavelength that is absorbed by methane gas. Thus, regions that appear white or bright red are those that reflect sunlight before it passes through a large quantity of methane. The image reveals the presence of a ubiquitous haze that covers Neptune in a semitransparent layer. JPL/NASA
A long-exposure Hubble Space Telescope image shows a majestic face-on spiral galaxy located deep within the Coma Cluster of galaxies, which lies 320 million light-years away in the northern constellation Coma Berenices. The galaxy, known as NGC 4911, contains rich lanes of dust and gas near its center. NASA/ESA/Hubble Heritage Team (STScI/AURA)
The Soyuz TMA-19 spacecraft relocates from the Zvezda Service Module's aft port to the Rassvet Mini-Research Module 1 of the International Space Station. Russian cosmonaut Fyodor Yurchikhin; along with NASA astronauts Doug Wheelock and Shannon Walker, all Expedition 24 flight engineers, undocked their Soyuz spacecraft from Zvezda’s aft end at 3:13 pm. on June 28, 2010, and docked it to its new location on the recently installed Rassvet module 25 minutes later. NASA
Sophisticated and lethal, growing in number, Islamic State and other extremist groups won't become a global force. Here's why.
BySeth G. Jones, Contributor
Raqqa Media Center of the Islamic State Group/AP
Mullah Abdul Rauf Khadim looked like any ubiquitous insurgent commander in southern Afghanistan. He had a sunbaked complexion, serried black beard, charcoal eyes, and the usual accessory – an AK-47 slung over his shoulder.