10 Common Digestive Disorders. The spleen is part of the lymphatic system, which plays a role in immunity and maintenance of healthy blood cells. It is an important organ and is affected by disorders of the blood, liver, and immune system. An enlarged spleen is known as splenomegaly. Although hepatosplenomegaly often produces no symptoms, it is known to cause abdominal pain in the upper portion of your abdomen.
NASA is sending astronaut Scott Kelly to live on the International Space Station for a year. That's the longest any U.S. astronaut has spent in space and twice as long as crew members usually stay on the space station. A year is a long time to stay anyplace. But staying a year in space has some special challenges.
NASA is live-streaming breathtaking footage from the International Space Station It takes the space station about 90 minutes to orbit the planet, with a total of around 15 trips done every 24 hours. As the station passes into night time for 45 minutes every orbit, the live feed falls dark.