Artificial Skies

Look up on a clear night and you might see the moon, stars, an airplane, a Pentagon observation balloon, police drone, one of Elon Musk's Starlink communication satellites, or a Loon balloon from Google's Alphabet fleet that can provide wireless internet access to rural and remote areas.

     Shortly after a Starlink rocket launch, a satellite is almost as bright as the North Star, a magnitude 2. When it reaches its orbiting height 342 miles above Earth, unless sunlight hits just the right angle, the satellite dims to magnitude 5 to 7. Beginning three to four hours after sunset in a summer, satellites can be visible to the naked eye all night.

     With U.S. Federal Communications Commission (FCC) approval, Musk's SpaceX program is in the process of launching 12,000 satellites in a Starlink network designed to facilitate high-speed, global broadband internet access. Sometime in June, 2020, a SpaceX Falcon 9 rocket is expected to launch the eighth batch of satellites, about 60 more, for the broadband network.  His artificial satellite constellation raises concerns about space safety and the impact on ground-based telescopes exploring deep space.

     At different heights above Earth, the orbits of satellites pose different problems. At about 300 miles or less, atmospheric drag downs and vaporizes satellites. Starlink system satellites designed to orbit 700 miles above Earth are too high for a quick and disintegrating re-entry. If satellites carry fuel, working ones can be maneuvered back to higher levels, and high-level ones that no longer work can be lowered and subjected to disintegration. Of course, the presence of fuel in a satellite increases the chance of an explosion.

     Whether working or out-of-service, at any level above Earth satellites can collide and break apart into "space junk." Fragments of debris go into their own separate orbits ready to cause additional collisions and, therefore, even more space junk. That is what happened when the Chinese sent a missile to hit a satellite no longer in use. Resulting shrapnel fanned out into numerous orbits of space junk. Potentially, damaged debris could necessitate avoiding whole regions of space.

     Besides the danger of collisions, bright satellites that compete with the stars are a problem for astronomers who have been exploring deep space for centuries. Since photographing objects light years away can require exposing an image for hours, satellites orbiting the Earth already spoil the view. Those who use radio telescopes to study the universe expect interference from satellite transmissions that use frequencies close to the radio waves from distant objects.

     Loon's internet balloons fly at 10 to 15 miles above Earth. With five to 10 balloons, Loon is especially useful in providing temporary service to an area in need of communication after a disaster. Service is now provided in Puerto Rico, Peru's rainforest, and Kenya.

     Problems associated with space, including satellites, balloons, spacecrafts, and military applications, are expected to worsen. In addition to the approximately 5000 satellites already orbiting Earth and 12,000 launched by SpaceX, the OneWeb company plans to add 650 and Amazon's broadband project would deploy 3200. Along with the satellites powering the U.S. GPS, other navigation systems: Russia's GLONASS, China's BeiDou, the EU's Galileo and OneWeb, now owned by the UK and India's Bharti Global, also have launched satellites. Unless atmospheric drag is allowed to remove space junk and satellites no longer in use, the likelihood of collisions and interference with deep space research will increase unchecked.

     At present, no international agreements govern the safe use of space, observes Dr. Lisa Ruth Rand, a research associate at the Smithsonian's National Air and Space Museum and post doctoral fellow at the University of Wisconsin. To date, the use of space seems to rely on the ambitions of Elon Musk, individual countries and companies, and aliens exploring new frontiers. Urgent international negotiations are needed, at least by Earthlings. 

   

   

   

The Next War?

Throw out traditional texts on military strategy, if you count cyberwarfare which already has begun and the war envisioned by the February, 2016 Munich Security Conference.

   The Munich Conference expects future wars will engage killer robots with GPS guidance systems, facial-recognition technology, and artificial intelligence that wouldn't get tired, scared, or hungry and wouldn't retreat. Some suggest these robots would be less dangerous and more precise than land mines or nuclear bombs.

      But others warn that the same hackers who can alter data in electrical grids, hospitals, and financial markets could disrupt what military robots will do. Also, hackers could disrupt the so-called Internet of Things (IoT): cars, elevators, thermostats, refrigerators and other appliances that are directed by smart chips. For example, they could turn the IoT into spies on enemies.

Play, Computer Connections, and Pets Come to the Aid of Sick Kids

Years ago when my four-year-old daughter was in the hospital with an infection, there was a room reserved for play, where needles, pills and painful procedures were banned. She really perked up when she learned to play her first video game.

     Nowadays, a new pilot project designed by Gokul Krishman, a Ph.D. candidate at Children's Hospital at Vanderbilt University, is bringing a mobile creative space to young patients who can't leave their hospital rooms. Drawing on the idea of the MakerMovement, a cart carries a 3-D printer, tablet computer on a swivel arm, a circuit board that cycles lights through the rainbow, and bins filled with items kids can use to create solutions to problems they face in the hospital. Of course, patients can communicate room to room using the computer.

     One patient wanted to stop nurses from just entering her room without knocking, so she fitted a tissue box with wires and switches and posted a sign on her door that read, "Ring My Doorbell." Another stopped nurses from waking sleeping patients by making a Nurse Night Light that only lit up the toilet and trash areas of his room.

     Developed in Israel, a new "Sesame" Google Nexus Phone enables those with certain disabilities to mAake telephone calls by using gestures and voice controls.

     The later post, "Want to Reach Global Citizens?" reports on the free AFLAC ducks the insurance company gives hospitalized children to help them use emojis to tell the medical staff and visitors how they feel. 

     Even back in 2002, before there was Skype, Len Forkas worked with a school system's head of technology to equip his sick son's home bedroom and fourth grade classroom with computers and cameras and an internet connection. Microsoft's NetMeeting software enabled the boy with acute lymphoblastic leukemia to see his classroom and to talk with friends every morning and after recess. Based on this initial experience, Hopecam (hopecam.org) now works with schools to cut through red tape to provide kids homebound with
cancer with tablet computers, web cameras, and high speed internet connections that enable them to participate in classroom activities and interact with their friends. Sometimes, even if a child only Skypes for a half hour with classmates each week, parents report that this little spot of sunshine makes a big difference.

     Julia Havey, a nurse at the Marcella Niehoff School of Nursing at Loyola University in Chicago,
observed that brief interactions with pets also could make a big difference for a group of her patients. If they received daily visits from specially trained dogs for five to 15 minutes while they were recovering from total joint-replacement surgery, they required 28% less oral pain medication than those in a group similar in age, gender, ethnicity, length of hospital stay, and the same type of total joint replacement who did not receive animal therapy visits. Havey concluded that therapy animals can have a positive influence on human recovery, because the animal-human connection reduces stress and generates a sense of well-being. Indeed, other research has found that interaction with pets decreases the level of the cortisol stress hormone and increases endorphins, considered the happiness hormone.

      The organization, Dogs on Call (dogsoncall.org), provides pet therapy dogs not only to hospitals, nursing homes, assisted living facilities, and hospices, but also to libraries, dorms, and schools where students are stressed, especially during final exams.

(For other examples of ways to improve the lives of sick kids, see the blog post, "Robots for Good.")