A blast from the past: Using data from four telescopes, NASA created this image of the first documented sighting of a supernova, made by Chinese astronomers in 185 A.D. NASA/JPL-Caltech/B. Williams hide caption

itoggle caption NASA/JPL-Caltech/B. Williams

International Space Station Commander Barry "Butch" Wilmore holds up the first object made in space with 3-D printing on Nov. 25. NASA hide caption

itoggle caption NASA

The Rosetta spacecraft, which orbits the comet, captured this series of images of the Philae lander bounding off the surface. The precise spot the lander came to a stop remains unknown. Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA hide caption

itoggle caption Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

The moon appeared bigger and brighter when it went supermoon on June 23, 2013 — especially when it was seen next to objects on the horizon, such as the helicopter from the original Batman television show at the New Jersey State Fair last year. Julio Cortez/AP hide caption

itoggle caption Julio Cortez/AP

The Cassini spacecraft has been taking radar images of Titan for years now. This modified image of the Ligeia Mare, a sea on Titan's north pole, is a composite of some of those. NASA/JPL-Caltech/ASI/Cornell hide caption

itoggle caption NASA/JPL-Caltech/ASI/Cornell

An artist's rendering of Kepler-186f, the first validated Earth-size planet to orbit in the habitable zone of a distant star. T. Pyle/NASA/SETI Institute/JPL-Caltech hide caption

itoggle caption T. Pyle/NASA/SETI Institute/JPL-Caltech

This diagram for the outer solar system shows the orbits of Sedna (in orange) and 2012 VP113 (in red). The sun and terrestrial planets are at the center, surrounded by the orbits (in purple) of the four giant planets — Jupiter, Saturn, Uranus and Neptune. The Kuiper belt, which includes Pluto, is shown by the dotted light blue region. Scott S. Sheppard/Carnegie Institution for Science hide caption

itoggle caption Scott S. Sheppard/Carnegie Institution for Science