The visible apparent edge of a body (like a planet or asteroid).
In outer space, the distance to the horizon depends on the observer's altitude. For example, from the International Space Station (ISS) at about 400 km above Earth's surface, the horizon is approximately 2,984 km away. As the observer's altitude increases, the distance to the horizon also increases.
The horizon is generally described as the farthest extent in space that one can see. In science, it is described as the greatest limit in space that is observable to the naked eye or an instrument such as a telescope.
Vertical lines in space run perpendicular to the horizon. The very definition of perpendicular requires that the lines be at right angles to the horizon, so all lines that meet that definition are perpendicular.
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The event horizon of a black hole marks the boundary beyond which nothing, not even light, can escape the gravitational pull. This affects space by creating a region where the curvature of spacetime is so strong that it distorts both space and time, leading to extreme gravitational effects.
Ol' BETSY, or maybe... ol' rustbucket.
We can't see past the cosmological horizon because it represents the limit of the observable universe due to the expansion of space. Light from objects beyond this horizon has not had enough time to reach us since the beginning of the universe.
* Linear Perspective * Horizon Line * Vanishing Point * Orthogonal * Horizontal * Vertical
If you're talking about sky as in sky on this planet, then your answer would be the horizon (the point were the ground meets the sky from any vantage point on the surface). Or you could be talking about the atmosphere, which is the boundary between the earth and space and keeps life alive, and air on earth.
The space in an image that appears farthest away from the viewer is called the background or the depth of field.
Horizon observation: If you observe a ship sailing away, you will notice that its hull disappears before the top of the mast, indicating the curvature of the Earth. Satellites: Images from satellites show the Earth as a spherical shape. Space travel: Astronauts have viewed the Earth from space and confirmed its roundness.
a horizon