For astrodynamics reasons, cheap spacecraft travel to other planets is only practical within certain time windows.

For instance, the motion of a spacecraft, regarding its orbit and attitude ( rotation ), is described by the relativistic theory of classical mechanics, while the analogous movements of an atomic nucleus are described by quantum mechanics.

For instance, if limited onboard power fed to its engine was the dominant limitation on how much payload a hypothetical spacecraft could shuttle ( such as if intrinsic propellant economic cost was minor from usage of extraterrestrial soil or ice ), ideal exhaust velocity would rather be around 62. 75 % of total mission delta v if operating at constant specific impulse, except greater optimization could come from varying exhaust velocity during the mission profile ( as possible with some thruster types, including mass drivers and variable specific impulse magnetoplasma rockets ).

For example, a ramjet might collect 1 gram of incoming ions per second from interstellar space beyond the heliopause, at a velocity of 50 km / s relative to the ramjet driven spacecraft.

For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies.

For spacecraft near the Sun, solar panels are frequently used to generate electrical power.

For missions beyond low Earth orbit NASA is building the Space Launch System and the Orion spacecraft.

For the Mercury, Gemini, and Apollo spacecraft, such communications blackouts lasted for several minutes.

For the Apollo 13 mission, the blackout was much longer than normal because the flight path of the spacecraft was unexpectedly at a much shallower angle than normal.

For a rocket the payload can be a spacecraft launched with the rocket, or in the case of a ballistic missile, the warheads.

For example, nuclear pulse propulsion is a form of spacecraft propulsion that would use nuclear explosives to provide impulse to a spacecraft.

* For communications between spacecraft, including elements of a satellite constellation

For Salyut, small modifications had to be made to the docking port of the OPS to accommodate Soyuz spacecraft in addition to TKS spacecraft.

For this reason, reaction wheels are often used to aim spacecraft with cameras or telescopes.

For launches above low Earth orbit ( LEO ), the actual launch time can be somewhat flexible if a parking orbit is used, because the inclination and time the spacecraft initially spends in the parking orbit can be varied.

For example, consider a spacecraft travelling from the Earth to Mars.

For example, the capacity ( separated spacecraft mass ) of the Delta IV Heavy:

For example, if two spacecraft are in the same circular orbit and wish to dock, unless they are very close, the trailing craft cannot simply fire its engines to go faster.

For example, a dish antenna on a spacecraft is a high-gain device that must be pointed at the planet to be effective, whereas a typical Wi-Fi antenna in a laptop computer is low-gain, and as long as the base station is within range, the antenna can be in any orientation in space.

For communicating with the Deep Space Network, the spacecraft transmitted data across the x-band using a 0. 6-meter parabolic high-gain antenna, medium-gain antenna ( MGA ) and low-gain antennas ( LGA ) depending on mission phase, and a 15-watt transponder design originally intended for the Cassini spacecraft.

For storing data when the spacecraft was unable to communicate with Earth, the processor card was able to store 128-megabytes, 20 % of which was occupied by the flight system software.

For Mr. Kennedy, speaking softly and carrying a sizable stick is making the best of a bad situation.

For example, in a copper wire of cross-section 0. 5 mm < sup > 2 </ sup >, carrying a current of 5 A, the drift velocity of the electrons is on the order of a millimetre per second.

For reasons unknown, Domitian briefly exiled Domitia, and then soon recalled her, either out of love or due to rumours that he was carrying on a relationship with his niece Julia Flavia.

For example, some laws restrict carrying knives in public while other laws restrict private ownership of certain knives, such as switchblades.

For example, the federal and state governments in the United States divide misdemeanors into several classes, with certain classes punishable by jail time and others carrying only a fine.

For example the first stage of the Saturn V, carrying the weight of the upper stages, was able to achieve a mass ratio of about 10, and achieved a specific impulse of 263 seconds.

This was also the time when every other hero or villain in Spaghetti Westerns started carrying a musical watch, after its ingenious use in For a Few Dollars More.

Giuliano Gemma starred in a series of successful films carrying this theme – Adiós gringo, For a Few Extra Dollars, I lunghi giorni della vendetta, Wanted, and to some extent Blood for a Silver Dollar – where most often his character is called " Gary ".

For each test a Minuteman missile was launched from Vandenberg Air Force Base in California carrying a single mock re-entry vehicle targeted for Kwajalein lagoon more than away.

For example, " the marching Warriors ," a rock painting at Cingle de la Mola, Castellón in Spain, dated to about 7, 000 – 4, 000 BCE, depicts about 50 bowmen in two groups marching or running in step toward each other, each man carrying a bow in one hand and a fistful of arrows in the other.

For several days the two fleets sailed within view of each other, with de Grasse preferring to lure the British away from the bay, where de Barras was expected to arrive carrying vital siege equipment.

For example, two parallel coils separated by a small distance, carrying the same current in the same direction will produce a magnetic bottle between them.

For instance, in Thomas Jefferson ’ s " Commonplace Book ," a quote from Cesare Beccaria reads, " laws that forbid the carrying of arms ... disarm only those who are neither inclined nor determined to commit crimes ...

For his involvement, Catiline was accused of killing his former brother-in-law Marcus Marius Gratidianus, carrying this man ’ s severed head through the streets of Rome and then having Sulla add him to the proscription to make it legal.

For example, the Neolithic revolution increased the carrying capacity of the world relative to humans through the invention of agriculture.

For instance, the French mail service La Poste owns a few special TGV trains for carrying postal freight.

For example, Peggy Ashcroft, at the RST in 1950, played the role in a breastplate and carrying a sword.

For storage and carrying, the wing is usually folded into a stuffsack ( bag ), which can then be stowed in a large backpack along with the harness.

For instance, Denethor saw a black fleet of apparent reinforcements for Sauron's forces coming from supposedly safe territory, unaware that the ships were actually carrying Aragorn's forces coming to relieve the city.

February 27: Over one thousand protesters take part in an Arab nationalist demonstration in Jerusalem carrying banners bearing the slogans " Stop Zionist Immigration " and " Our Country For Us ".

For Behan's " testimony to make any sense, the court would have to believe that Holliday marched down Fremont Street carrying a shotgun ; put it aside in order to pull out his pistol ; fired the first shot, presumably at Billy Clanton ; and then picked up the shotgun in order to kill Tom McLaury — all in the space of a few seconds.

For example, in 1970, he expelled four Soviet diplomats for carrying out " subversive activities ," and in 1971, twenty Soviet officials were declared persona non grata for allegedly instigating student demonstrations at Lovanium University.

For example, a population growing in a limited environment can approach the ultimate carrying capacity of that environment in several possible ways.

For example, Biblical law prohibits Jews from carrying objects from a private domain (" reshut ha-yachid ") to a public domain (" reshut ha-rabim ") on Sabbath required.