Despite decades of ongoing research, scientists are trying to understand how the four fundamental forces of the Universe fit together. Whereas quantum mechanics can explain how three of these forces things work together on the smallest of scales (electromagnetism, weak and strong nuclear forces), General Relativity explains how things behaves on the largest of scales (i.e. gravity). In this respect, gravity remains the holdout.
This nighttime photo of Florida was taken from the International Space Station by Expedition 51 Flight Engineer Thomas Pesquet of the European Space Agency, in March 2017. Bright lights of cities stand out, including the Miami-Fort Lauderdale metropolitan area, the Tampa Bay region along the Gulf Coast, and in the middle, Orlando.
A new, nearly self-sufficient plant growth system by NASA is headed to the International Space Station soon and will help researchers better understand how plants grow in space. The Advanced Plant Habitat will be used to conduct plant bioscience research on the space station, and help NASA prepare crew to grow their own food in space during deep-space exploration missions.