Shiiiett

Limits

Mars

Kumamoto,Japan | takaphilography

Orbit change of artificial satellite

In order to raise the altitude of an artificial satellite, it is necessary to accelerate it. When the orbital speed increases, the centrifugal force generated by the rotation of the satellite becomes stronger than the gravity of the earth applied to it, then the altitude rises. At this time, a certain amount of energy is returned from the satellite to the vacuum space to reduce the energy debt. Hence the orbital speed decreases and finally drops below the initial speed. The sum of the reduced amount of the momentum energy and the energy required for the acceleration is returned to the vacuum space.

In order to lower the altitude of an artificial satellite, it is necessary to decelerate it. When the orbital speed decreases, the centrifugal force becomes weaker than the gravity, then the altitude drops. At this time, the satellite is given a certain amount of energy from the vacuum space. Hence the orbital speed increases and finally rises above the initial speed. The sum of the increased amount of the momentum energy and the energy released by the deceleration is borrowed from the vacuum space.

Unprecedented footage from Costa Rica shows tiny tropical lizard (Water Anole) “breathing” from an air sac suspended atop their snouts—an apparent scuba tank that helps them stay submerged for extended periods.

As the lizards lie motionless underwater, bubbles can periodically be seen appearing above their snouts. The bubbles quickly expand in size, and then shrink. It may very well be a form of underwater respiration, in which oxygen is pulled from the recycled air bubble on the lizard’s head, though further research will be required to validate these visual observations.

Seeing the world from under ! 🐠🐠🐠💦🌊 | benthouard

Location: French Polynesia

Saint Veronica with the Veil (Original piece by Mattia Preti c.1655-1660) Touched by Clayshaper