...especially favourable orbit for satellite communications, because satellites in GEO appear from the ground to be stationary. However, gravitational forces exerted by the Sun and Moon cause their orbits to change and they must continually apply thrust...
... reusable rockets to suborbital planes, and even convertible cars orbiting the sun near Mars. However, for some companies with business models based on radical technology, the situation has become difficult in recent months; for example, companies...
... like NASA could come up with, Artemis stands for ‘Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon’s Interaction with the Sun’. NASA’s objective is to herald in a new era for space exploration and utilisation and, while...
... and radar discoveries from the early years included the rotation rate of the planet Mercury and the period of the Crab pulsar, a rotating neutron star. Before Arecibo, Mercury was thought to be tidally locked to the Sun, with orbital and rotational...
... that such extreme, rapid changes were not originally predicted by computer models as the comet approached perihelion (the point in its orbit when its closest to the sun). Whatever forces are at work on 67P/Churyumov-Gerasimenko – we must still find...
... unexpected. NASA resumed efforts to contact STEREO-B after it had moved further away from the sun and sun radio interference could no longer impede signals. The lines of communication to both STEREO spacecraft—Ahead in red and Behind in blue—are...