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Which is not evidence that Earth is a sphere?
One possible indicator that Earth is not a sphere is the perception that the horizon appears flat when observed from ground level over long distances. Additionally, some flat Earth proponents argue that lack of noticeable curvature in the horizon suggests a non-spherical Earth.
What do the Celestial equator and the horizon have in common?
The celestial equator and the horizon are both reference planes used in astronomy to locate celestial objects. The celestial equator is an imaginary line that divides the celestial sphere into the northern and southern hemispheres, while the horizon is the boundary between the sky and the Earth, marking what is visible from a specific location. Both concepts are crucial for understanding the positions and movements of stars and planets as observed from Earth. Additionally, they are both perpendicular to the axis of rotation of the Earth.
How to determine Average density within an event horizon?
Simply divide the mass of the black hole by the volume contained within the event horizon. This is fairly simple for a typical black hole, since the event horizon will approximate a sphere whose radius is the collapsed object's Schwarzschild radius.
What is difference between great circle and small circle?
A great circle is a circle on the surface of a sphere that has the same center as the sphere, while a small circle does not share the same center as the sphere. Great circles have the largest circumference of all circles on a sphere, whereas small circles have smaller circumferences. The equator is an example of a great circle on Earth, while lines of latitude other than the equator are examples of small circles.
What is the difference between equator and Equator?
An equator is the intersection of a sphere's surface with the plane perpendicular to the sphere's axis of rotation and containing the sphere's center of mass; whereas, the capitalized term Equator refers to the Earth's equator.
How does the photon sphere of a black hole compare to its event horizon?
The photon sphere of a black hole is a region where light can orbit the black hole before being pulled in, while the event horizon is the point of no return where nothing, not even light, can escape the black hole's gravitational pull. The photon sphere is closer to the black hole than the event horizon.
What is the difference between a hemisphere and a sphere?
Sphere is whole a hemisphere is not
What is the difference between a sphere and in a hemisphere?
A hemisphere is half a sphere
What is the role of altitude for a black hole?
The escape velocity is affected by altitude for any celestial body; the further away from the mass, the lower the escape velocity from that point. At the event horizon, the escape velocity is the speed of light. Within the photon sphere but outside the event horizon, light paths not pointing outward will intersect the event horizon. At the photon sphere, a notionally tangential light beam would ideally remain in a perfectly circular "orbit" around the black hole (although, traveling in a geodesic, the light beam will be only traveling straight as far as it's concerned, space itself is bent).... outside the photon sphere, the escape velocity continues to fall with distance.
What is the difference between cylinder and a sphere?
A sphere has 0 vortex and a cylinder has 2 faces
What is the difference between a square pyramid and a square sphere?
They are very different, as a square sphere is impossible. The difference is that a square pyramid exists, whereas there's no such thing as a square sphere.
Difference between cube and sphere?
A cube is a three dimensional square, and a sphere is a three dimensional circle.
What is the difference between a orb and a sphere?
Literally they both mean ball (orb from Latin, sphere from Greek).
Difference between a sphere and a cone?
A sphere to a cone is the same as a circle is to a triangle but they are both 3 dimensional.
What is the difference between a protectorrate and a sphere of influence?
Give a chance
Why do you have horizon?
Because the earth is a sphere. The horizon is the curvature of the earth (or other planet) as it falls away from you.
What is difference between torus and sphere?
A sphere is round - like a tennis ball. A torus is ring-shaped - like a donut !
