Download Leaving Orbit Ebook PDF

Nuclear-powered Earth-orbital-launch probes can place greater payloads in orbit about Mars than chemical vehicles if reactor power exceeds 50 mw. Suitable reactor powers for this missionARE ABOUT 150, 400, AND 1000 MW FOR 33,000-, 81,000-, AND 200,000-LB VEHICLES, RESPECTIVELY. Whereas a 33,000-lb vehicle requires greater than a 200-day coast, a 145-day coast is feasible for an 81,000-lb vehicle. A hydrogen temperature of 4000 F in the nozzle appears to be a good compromise. Use of a solid-propellant rocket to achieve an orbit about Mars from coast yields no payload advantage. Using optimum firing dates, a 33,000-lb vehicle could orbit an acceptable payload about Mars, and an 81,000-lb vehicle could land freight on Mars. (Author).

Explains how scientists can use current technology to send humans to Mars; produce fuel and oxygen on the planet's surface; build bases and settlements; and one day terrafor-- or alter the atmosphere of the planet.

The Celestial Watcher knows all, an immortal omnipresent entity, it has been witness to a 40,000 year unfolding story, a star-ship lost, a legacy left by its crew. The Ancestors must return to right an injustice, but more they need to search their moral conscience and return to the Cygnus constellation and the seed colonies they abandoned 1.68 million years ago.

Arsic unpacks Ralph Waldo Emerson's repeated assertion that our reality and our minds are in constant flux. Her readings of a broad range of Emerson's writings are guided by a central question: what does it really mean to maintain that everything fluctuates, is relational, and so changes its identity?

It's a hard life being a Frontier Corps Ranger in Sector 12. Operating outside human-controlled space, dealing every day with hostile alien governments, criminals, anti-Frontier Corps paramilitary groups and the like while serving simultaneously as soldier, scout, operative, spy and roving law enforcement officer. Still Red (or Rab, or Rubicon, or a lot of other less polite names, ) manages to stay on top of things. Sure his methods might be just a mite, err, dynamic, garnering (wholly baseless) charges of being terminally insane, but at least he's always gotten the job done. So far. His current assignment might break that streak. A Frontier planet is the victim of extremely barbaric raiders, and the Ranger they've sent a distress call to is unavailable. In order to fulfill his mission Red might have to be polite to the settlers, maintain cordial relations, and worst of all, perhaps even compromise here and there. To die trying no longer seems like the worst possible outcome.

This book provides an intuitive yet sound understanding of how structure and properties of solids may be related. The natural link is provided by the band theory approach to the electronic structure of solids. The chemically insightful concept of orbital interaction and the essential machinery of band theory are used throughout the book to build links between the crystal and electronic structure of periodic systems. In such a way, it is shown how important tools for understanding properties of solids like the density of states, the Fermi surface etc. can be qualitatively sketched and used to either understand the results of quantitative calculations or to rationalize experimental observations. Extensive use of the orbital interaction approach appears to be a very efficient way of building bridges between physically and chemically based notions to understand the structure and properties of solids.

In a future where anything alien is mistrusted, Doctor Xander Vargas hides his true nature. Reassignment to a new ship is the second chance he needs, and spoiling it isn't an option. Until he meets his one temptation, a woman his alien genes would kill for. -- Years after the abduction that turned him into a cyborg, Kaiden remains broken in heart and body. Then the queen assigns him an investigation more disappearances like his own, and he hopes to find the closure he needs. He should be focused on the mission. Nothing else should matter. But the spy working along with him is infuriatingly distracting. But their attraction will have to be placed on hold, because the enemy will do anything to make Kaiden disappear one more time… forever. -- Living on the run for nine years has made Evangeline a skeptical woman. With a new face and a fabricated identity, she sails the stars as captain of her own mercenary ship. Online virtual reality games return a fraction of the life stolen from her by the Royal Navy’s betrayal. Gareth dedicates his life to military life and training his psychic powers. Dating hasn’t entered the equation, unless one counts the redheaded spitfire he games with online. When Evie finally invites Gareth to meet her in person at the galaxy’s best entertainment hub, the offer seems too good to be true—because it is. Humanity’s biggest threat has their eye on the space station, and they’ll be in for the fight of their lives.

The novelization of the latest Star Trek blockbuster movie! When the crew of the Enterpriseis called back home, they find an unstoppable force of terror from within their own organization has detonated the fleet and everything it stands for, leaving our world in a state of crisis. With a personal score to settle, Captain Kirk leads a manhunt to a war-zone world to capture a one man weapon of mass destruction. As our heroes are propelled into an epic chess game of life and death, love will be challenged, friendships will be torn apart, and sacrifices must be made for the only family Kirk has left: his crew.