Astronomers have developed several ways to measure the vast distances between Earth and the stars and galaxies. What do you know about two of these techniques? A. An astronomical unit is about 93 million kilometers.

B. The A. U. is used to measure distance within our solar system.

C. A light-year (ly) is the distance that light can travel in one year in a vacuum.

D. An astronomical unit (A. U.) is the average distance between the Earth and the Sun.

E. Astronomers measure distances to objects which are outside our solar system in light-years.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

stratosphere, is the answer for (apex)