Beyond Earth - Class 6 Science Free MCQ Test with solutions

Stars are like big light bulbs in the sky. They make their own light because they are very hot and go through a process called nuclear fusion. Planets, on the other hand, do not make their own light; they only reflect the light from the Sun. That’s why we see stars shining, but planets look like little dots in the sky.

Orion is one of the most famous constellations in the night sky. It is easily identified by the three bright stars that form a line, which is known as Orion's Belt. These stars make the shape of a hunter, and the belt is a key feature of this constellation.

Light pollution is caused by too much artificial light from streetlights, buildings, and other sources in cities. This bright light makes the night sky too bright to see stars clearly. In urban areas, this artificial light hides the stars, making it hard to observe them.

The water cycle is the continuous movement of water on, above, and below Earth's surface. The Sun plays a key role in this process by heating water in oceans, lakes, and rivers, causing it to evaporate into the air. This water then condenses to form clouds and falls back to the ground as rain, continuing the cycle.

Comets are made of dust, ice, and gases. When they get close to the Sun, the heat causes the ice to melt and release gases, forming a glowing cloud called a coma and a bright tail that points away from the Sun.

Revolution is the term used to describe the movement of a planet around the Sun. It takes a planet one year to complete one full revolution around the Sun. This movement is what causes the change in seasons on Earth.

Mars is called the "Red Planet" because its surface looks red due to the presence of iron oxide (rust). This gives it a reddish appearance when seen from Earth.

Our Solar System is located in the Milky Way Galaxy, which is a spiral galaxy. The Milky Way contains billions of stars, and our Sun is just one of them, along with the planets that revolve around it.

The Sun is the main source of light and heat for Earth. It helps keep the planet warm and is crucial for life, providing energy for plants and regulating the Earth's climate.

• Venus is often referred to as the "Morning Star" or "Evening Star" because it is bright enough to be seen during twilight.
• It is typically visible either shortly before sunrise (dawn) or shortly after sunset (dusk).
• Due to its orbit, Venus spends most of the year in these twilight positions, making it easy to spot during these times.