please tell this answer fast because I need your help
Answers
Answer:
accurate
mass is acctual space occupied by an object
and weight is Strength of gravity towards an object
as already obtained distances of 1 billion stars, about 1 percent of all the stars in the Milky Way, and produced spectacular 3D maps.
formula : Angular Diameter = 206265 X (Actual diameter / Distance)
Answer:
9= acuuracy or precision of the instrument means the correct reading of the data by the instruments.
10= mass is the actual matter contained in a body where there is no effect of gravity whereas weight is the total mass of the body due to the gravity. w=mass *gravity
11= Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.
Parallax is “the best way to get distance in astronomy,” said Mark Reid, an astronomer at the Harvard Smithsonian Center for Astrophysics. He described parallax as the “gold standard” for measuring stellar distances because it does not involve physics; rather, it relies solely on geometry.
The method is based on measuring two angles and the included side of a triangle formed by the star, Earth on one side of its orbit and Earth six months later on the other side of its orbit, according to Edward L. Wright, a professor at the University of California, Los Angeles.
It works like this: hold out your hand, close your right eye, and place your extended thumb over a distant object. Now, switch eyes, so that your left is closed and your right is open. Your thumb will appear to shift slightly against the background. By measuring this small change and knowing the distance between your eyes, you can calculate the distance to your thumb.
Explanation: formula:Angular Diameter = 206265 X (Actual diameter / Distance)
in our solar system objects are larger than the Moon, they are also much farther away. Therefore they appear to be small, and it is more practical to measure their angular sizes in seconds of arc, rather than minutes or degrees.