The sphere far outside the Solar System is called the "Oort Cloud", after the astronomer who predicted its existence.
The hypothetical sphere around the solar system is known as the Oort Cloud. It is a region of space theorized to contain icy objects and comets that extends far beyond the orbit of Pluto. The Oort Cloud is thought to be the source of long-period comets that occasionally enter the inner solar system.
No, a coin is not a sphere. Coins are typically circular in shape, and their structure is flat with two sides. A sphere is a three-dimensional round object in which all points on its surface are the same distance from its center.
If by "flattened" you mean "like someone took a sphere and sat on it", that would be an oblate spheroid.
The inside of a planetarium is a sphere with the stars and planets projected on to it. The celestial sphere is an infinite sphere that we imagine has the stars and planets on it. On the celestial sphere only an object's direction matters and its distance is ignored. A viewer at the centre of the planetarium sees stars and planets as they appear in the sky, but viewers in all the seats see approximately the right view.
The name for the sun's sphere of light is called the photosphere. It is the visible surface of the sun that emits light and heat.
The circumference.
Sphere.
That is called a sphere.
Surface of a sphere
It is a sphere.
It is not exactly a sphere, the longest axis is 15km and the shortest one is 8km.
a sphere
Sphere
The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.
The radius
A curved surface on which all points are the same distance from the center is called a sphere.
Diameter is distance across a circle or sphere, circumference is the distance around a circle or sphere