Pesquisando por: "Earth and moon" - Fotoarena - Agência de fotojornalismo

PIX4639391 Permanent station between the Earth and the Moon - Artist view - Lunar cycler at apogee - Artist view - Lunar Cycler is a space station placed in orbit between the Earth and the Moon whose trajectory would alternate between the Moon and the Earth. Once positioned in orbit, this gravitational assistance vessel would use very little fuel. This project would make a permanent link between the two stars. A lunar cycler has reached its furthest orbital point from the Earth - the apogee - and is rounding the far side of the Moon to begin its fall back towards Earth. At apogee the lunar cycler is about 300 thousand miles from the Earth and 50 thousand miles beyond the orbit of the Moon (further from Earth than any human has ventured yet). If frequent manned trips to the Moon become a reality, the earlier “” throw-away”” technologies of the Apollo lunar missions will be impractical for the long term. More efficient and reusable systems will need to be developed in order to minimize the labor and resources required for these extraordinary voyages. A journey to the Moon can be broken down into three basic tasks: transfer between the Earth's surface and Earth orbit, transfer between Earth orbit and lunar orbit, and transfer between lunar orbit and the Moon's surface. While the simplest solution may be a single vehicle that could do all three, no technology today or in the foreseeable future can meet all these needs. One solution would be to dedicate separate vehicles for each the three tasks. A reusable space shuttle would lift explorers off the Earth's surface, a dedicated and reusable lunar shuttle would deliver explorers to the Moon's surface and back, and in between there would be a kind of orbital way station. One such way station is known as an orbital cycler. An orbital cycler is a vehicle that's in a permanent orbit around two celestial masses. In the case of a lunar cycler, the orbit would include both the Eart

PIX4577425 Lever de Terre et la Lune vus depuis LRO. 10/2015 - Earthrise and Moon as seen from LRO. 10/2015 - Lever de Terre au - dessus de la Lune vu depuis Lunar Reconnaissance Orbiter (LRO). Composite d'images obtenues le 12 octobre 2015. NASA's Lunar Reconnaissance Orbiter (LRO) captured a unique view of Earth from the spacecraft's vantage point in orbit around the moon. In this composite image we see Earth appear to rise over the lunar horizon from the viewpoint of the spacecraft, with the center of the Earth just off the coast of Liberia (at 4.04 degrees North, 12.44 degrees West). The large tan area in the upper right is the Sahara Desert, and just beyond is Saudi Arabia. The Atlantic and Pacific coasts of South America are visible to the left. On the moon, we get a glimpse of the crater Compton, which is located just beyond the eastern limb of the moon, on the lunar farside. LRO was launched on June 18, 2009, and has collected a treasure trove of data with its seven powerful instruments, making an invaluable contribution to our knowledge about the moon. LRO experiences 12 earthrises every day; however the spacecraft is almost always busy imaging the lunar surface so only rarely does an opportunity arise such that its camera instrument can capture a view of Earth. Occasionally LRO points off into space to acquire observations of the extremely thin lunar atmosphere and perform instrument calibration measurements. During these movements sometimes Earth (and other planets) pass through the camera's field of view and dramatic images such as the one shown here are acquired. This image was composed from a series of images taken Oct. 12, when LRO was about 83 miles (134 kilometers) above the moon's farside crater Compton. Capturing an image of the Earth and moon with LRO's Lunar Reconnaissance Orbiter Camera (LROC) instrument is a complicated task. First the spacecraft must be rolled to the side (in this case 67 degrees), then the spacecraft slews with the direction of travel