While it's true that the Earth does not have a designated top or bottom in space, the reason most images of the Earth appear from the same angle is due to the perspective from which they are captured. Here are a few key points to consider:
Satellite and spacecraft orbits: Most images of the Earth are taken by satellites or spacecraft that are in orbit around the planet. These satellites are typically placed in specific orbits around the Earth, which allows them to maintain a consistent vantage point relative to the planet's surface. They follow a specific path and capture images as they move along that path, resulting in a consistent angle of view.
Geostationary satellites: Some satellites, known as geostationary satellites, are placed in an orbit directly above the Earth's equator at an altitude of approximately 36,000 kilometers (22,000 miles). From this height, these satellites can maintain a fixed position relative to the Earth's surface, appearing stationary from the ground. They are often used for weather monitoring, communication, and broadcasting purposes. Images captured by geostationary satellites would consistently show the Earth from the same angle.
Polar orbiting satellites: Other satellites are in polar orbits, which means they pass over or near the Earth's poles on each orbit. These satellites provide images from different angles as they orbit the Earth, allowing for a broader perspective. However, due to the nature of their orbits, the images they capture are typically stitched together to create a complete view of the Earth's surface, which may appear as a consistent angle in the final composite image.
Astronauts in space: Images taken by astronauts aboard the International Space Station (ISS) or during space shuttle missions also tend to show the Earth from a similar angle. This is because the space station and shuttles generally follow a specific trajectory around the Earth, resulting in images captured from a relatively consistent perspective.
It's worth noting that there are various types of images of the Earth captured from different angles, such as images from different satellites, spacecraft, or missions. However, the most commonly shared images of the Earth, especially those seen in popular media, may often show a similar angle due to the factors mentioned above.