The ability of an instrument such as a telescope, to distinguish objects that are close to each other. The angular resolution of an instrument is the smallest angular separation at which the instrument can observe two neighboring objects as two separate objects. The angular resolution of the human eye is about a minute of arc, while it can get up to 0.7' arc min for people with an extreamly good eyesight.
The apparent size of an object in the sky, or the distance between two objects, measured as an angle. Your index finger held at arm’s length spans about 1°, your fist about 10°.
מפתח הטלסקופ. ראה הרחבה במאמר לבחירת טלסקופ.
The point in its orbit where a planet is farthest from the Sun.
The apparent brightness of an object in the sky as it appears to an observer on Earth.
A region of space between Mars and Jupiter where the great majority of asteroids is found
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A scientist who studies the universe and the celestial bodies residing in it, including their composition, history, location, and motion.
The average distance from the Earth to the Sun; 1 AU is ~149,597,900 kilometers (~92,960,120 miles).
The layer of gases surrounding the surface of a planet, moon, or star
A broadly accepted theory for the origin and evolution of our universe. The theory says that the observable universe started roughly 13.7 billion years ago from an extremely dense and incredibly hot initial state.
System of two stars that revolve around a common center of gravity.
Stars that are very massive will collapse under their own gravity when their fuel is exhausted. The collapse continues until all matter is 'crushed' into what is known as a singularity. The gravitational pull of a black hole is so strong that from a certain distance not even light can escape.
An exploding meteorite
A type of reflecting telescope whose eyepiece is located behind the primary mirror. The primary mirror is cast with a hole in the center. When light enters the telescope, it reflects from the primary mirror to the secondary mirror. The secondary mirror reflects the light back through the hole in the primary mirror to the eyepiece.