Explanation

Isaac Newton proposed the law in 1687

and utilized it to clarify the observed movements of the planets and their moons.

The law of Gravitation had been mathematically formulated by Johannes Kepler in the early 17th century.

ND28-4-2023

Explanation

Astronomy is the study of everything in the universe beyond Earth's atmosphere

Galileo Galilei is often referred to as the "father of modern astronomy" and the "father of modern physics".

Explanation

Explanation

The Wright Brothers, Orville and Wilbur, invented and flew the first successful airplane.

This historic flight took place on December 17, 1903, in Kitty Hawk, North Carolina.

Explanation

Light year refers to speed of light expressed in miles per year

(it is about ten trillion kilometers or six trillion miles).

Light year is a unit of distance.

Light Year: the distance that light can travel in one year. 

The distance light travels in one year is known as the light year.

Explanation

Dialysis is a medical treatment used when the kidneys are unable to filter waste products from the blood, typically in renal (kidney) failure.

It helps maintain proper fluid and electrolyte balance in the body.

Explanation

About 97% of the Earth's water is contained in the oceans, which is saltwater.

The remaining 3% is freshwater, but most of it is frozen in glaciers and polar ice caps.

Only about 0.3% of the Earth's water is freshwater that is readily available for human consumption, agriculture, and other uses.

Explanation

The age of a tree is determined by counting its growth rings.

They are visible in the cross-section of the stem.

Each ring represents one year of growth.

Explanation

HCl creates an acidic environment (pH 1.5 to 3.5) that activates the enzyme pepsin from its inactive form, pepsinogen.

Pepsin then breaks down proteins into smaller peptides, facilitating digestion.

Explanation

The planet that revolves the slowest around the Sun is Neptune.

It takes Neptune approximately 165 Earth years to complete one orbit around the Sun.

This slow movement is due to Neptune's large distance from the Sun, which is nearly 4.5 billion kilometers.

Neptune is the farthest planet.

It was visited by the spacecraft Voyager 2.

It's is a very windy place.

It has six rings.

It has 14 moons.