The SpaceX Falcon 9 rocket and Dragon spacecraft, carrying supplies to the International Space Station, breaks apart shortly after liftoff at the Cape Canaveral Air Force Station in Cape Canaveral, Florida., Sunday, June 28, 2015. (AP)

The SpaceX Falcon 9 rocket and Dragon spacecraft, carrying supplies to the International Space Station, breaks apart shortly after liftoff at the Cape Canaveral Air Force Station in  Florida,  June 28, 2015. (AP)

A red aurora as seen from the International Space Station and tweeted by astronaut Scott Kelly on June 22, 2015. (NASA)

A red aurora as seen from the International Space Station and tweeted by astronaut Scott Kelly on June 22, 2015. (NASA)

The Florida Institute for Human and Machine Cognition’s walks up stairs made of unstable bricks on June 5, 2015 during DARPA’s (U.S. Defense Advanced Research Projects Agency) recent Robotics Challenge in Pomona, California. (AP)

The Florida Institute for Human and Machine Cognition’s ‘Running Man’ robot walks up stairs made of unstable bricks on June 5, 2015 during DARPA’s (U.S. Defense Advanced Research Projects Agency) recent Robotics Challenge in Pomona, California. (AP)

Members of the International Space Station's "Expedition 43" take a rest break shortly after landing safely in the steppes of Kazakhstan on June 11, 2015. The returning crew members are (L-R) Terry Virts of the U.S., Anton Shkaplerov of Russia and Samantha Cristoforetti of Italy. The trio spent 199 days aboard the space station. (NASA)

Members of the International Space Station’s “Expedition 43” take a rest break shortly after landing safely in the steppes of Kazakhstan on June 11, 2015. The returning crew members are (L-R) Terry Virts of the U.S., Anton Shkaplerov of Russia and Samantha Cristoforetti of Italy. The trio spent 199 days aboard the space station. (NASA)

NASA’s Cassini spacecraft flew past Saturn’s moon Dione on June 16, 2015. (NASA/JPL-Caltech/Space Science Institute)

NASA’s Cassini spacecraft flies past Saturn’s moon Dione on June 16, 2015. (NASA/JPL-Caltech/Space Science Institute)

Indonesia’s Mount Sinabung spews volcanic materials and hot molten lava from its crater on June 25, 2015. (AP)

Indonesia’s Mount Sinabung spews volcanic materials and hot molten lava from its crater on June 25, 2015. (AP)

This NASA/ESA Hubble Space Telescope image, released on June 26, 2015, shows a planetary nebula named NGC 6153, located about 4,000 light-years away in the southern constellation of Scorpius. (ESA/Hubble & NASA)

This Hubble Space Telescope image, released on June 26, 2015, shows a planetary nebula named NGC 6153, located about 4,000 light-years away in the southern constellation of Scorpius. (ESA/Hubble & NASA)

The Solar Impulse 2, a solar powered plane can be seen making its approach at Nagoya airport in Japan on June 1, 2015. The airplane, which is only powered by the energy of the Sun, is attempting a 35,000 km round-the-world flight. (Reuters)

The Solar Impulse 2, a solar powered plane, makes its approach at Nagoya airport in Japan on June 1, 2015. The airplane, which is only powered by the energy of the Sun, is attempting a 35,000 km round-the-world flight. (Reuters)

U.S. Navy sailors recover the test vehicle for NASA's Low-Density Supersonic Decelerator (LDSD) off the coast of Kauai, Hawaii on June 8, 2015. NASA officials said that the parachute inflated during the test of new technology for landing larger spacecraft on Mars, but it then disintegrated immediately afterward (U.S. Navy)

U.S. Navy sailors recover the test vehicle for NASA’s Low-Density Supersonic Decelerator (LDSD) off the coast of Kauai, Hawaii on June 8, 2015. NASA officials said the parachute inflated during the test of new technology for landing larger spacecraft on Mars, but it then disintegrated immediately afterward. (U.S. Navy)

Meet Xiomei. Seen during a demonstration, on June 3, 2015, at a class of China’s Jiujiang University, the robot teacher is able to narrate teaching materials and can respond to several voice orders like "repeat" or "continue". (Reuters)

Meet Xiomei. Seen during a demonstration,on June 3, 2015 at a class of China’s Jiujiang University, the robot teacher is able to narrate teaching materials and can respond to several voice orders like “repeat” or “continue.” (Reuters)

NASA’s Solar Dynamics Observatory (SDO) snapped this image of the sun emitting an M7.9 class mid-level solar flare that peaked at 0816 UTC on June 25, 2015. (NASA/SDO)

NASA’s Solar Dynamics Observatory (SDO) snapped this image of the sun emitting an M7.9 class mid-level solar flare that peaked at 0816 UTC on June 25, 2015. (NASA/SDO)