Theoretical physics: The origins of space and time. Many researchers believe that physics will not be complete until it can explain not just the behavior of space and time, but where these entities come from.
The Pioneer anomaly or Pioneer effect is the observed deviation from predicted accelerations of the Pioneer 10 and Pioneer 11 spacecraft after they passed about 20 astronomical units on their trajectories out of the Solar System. Both Pioneer spacecraft are escaping the Solar System, but are slowing under the influence of the Sun's gravity. The two spacecraft were launched in 1972 and 1973. The last communication with either spacecraft was in 2003, but analysis of recorded data continues.
The Whale Galaxy The Whale Galaxy (NGC 4631) lies in the constellation Canes Venatici the Hunting Dogs. This spiral system lies some 30 million light-years away. We are looking at it edge-on. Its center features a region of intense starburst activity. (12.5-inch PlaneWave corrected Dall-Kirkham reflector, SBIG STL-11000 CCD camera, LRGB image with exposures of 170, 50, 50, and 50 minutes, respectively) Kent Wood from Folsom, California