Sceiene (space)

What objects make up the Solar System?

A group of objects orbiting the Sun, including planets, moons, the asteroid belt (between Mars and Jupiter), comets, and human-made satellites like the ISS.

How many artificial satellites are currently operational?

About 1,000 satellites are operational today out of approximately 4,000 that have been launched.

When and how did the Solar System likely form?

Over 5 billion years ago from a spinning cloud of gas and dust that collapsed inward due to gravity after a supernova (star explosion).

What started the formation of the Sun?

Gravity pulled material together, which started nuclear fusion to form the Sun.

What is a comet?

A small icy object orbiting the Sun that forms a tail of gas and dust when it gets close to the Sun.

What is the difference between a meteor and the asteroid belt?

The asteroid belt is a region between Mars and Jupiter filled with rocky asteroids. A meteor is a piece of rock that burns up in Earth's atmosphere, creating a 'shooting star'.

What is the Oort Cloud?

A distant, spherical region far beyond Pluto that surrounds the Solar System and contains icy objects and comets.

How much of the total Solar System mass is contained in the Sun?

Approximately 98%.

What is the Sun’s actual color and why does it look yellow from Earth?

Its true color is white. It appears yellow due to atmospheric scattering of blue light.

How many stars can be seen with the naked eye under perfect conditions?

Up to 4,500 stars can be seen away from city lights and without a moon.

What are the 'Inner Planets' and their main characteristics?

Mercury, Venus, Earth, and Mars. They are terrestrial (composed of rock), have hard surfaces with features like canyons and volcanoes, and have few or no moons.

What are the 'Outer Planets' and their main characteristics?

Jupiter, Saturn, Uranus, and Neptune. They are gas giants (composed of hydrogen and helium), much larger than inner planets, have no solid surface, and have many moons and rings.

What are the two major planetary rotation 'exceptions' in our system?

Uranus is tilted and spins on its side. Venus spins in the opposite direction (retrograde).

What percentage of Earth's surface is covered by water?

71 percent.

What is the 'Blue Marble'?

A famous whole-Earth photograph taken during the Apollo Moon missions.

What is the International Space Station (ISS) used for?

It is a human-made satellite used for scientific experiments and exploration.