Explanation

• Comets are small celestial bodies made of ice, dust, and rock.
• When they approach the Sun, they form bright tails of gas and dust.

• Often called “dirty snowballs” due to icy composition.
• Comets follow highly elliptical orbits around the Sun.

Last verified on 19-01-2026

Explanation

The troposphere is the lowest layer of Earth’s atmosphere.

It extends from the Earth’s surface up to about 8–15 km (varies with latitude).

All weather phenomena like rain, clouds, and storms occur in this layer.

It contains approximately 75–80% of the atmosphere’s mass.

The temperature in the troposphere decreases with altitude.

Explanation

The Sun's diameter is approximately 1.4 million kilometers (864,000 miles)

Making it about 109 times wider than Earth, 

A massive size that dominates our solar system as a giant ball of hot hydrogen and helium. 

Explanation

Our solar system takes approximately 225 to 230 million Earth years to complete one full orbit around the center of the Milky Way galaxy,

A period known as a galactic year or cosmic year. 

Traveling at about 514,000 mph (828,000 km/h)

Given the Sun's age, it has circled the galactic center about 20 times. 

Explanation

A constellation is traditionally defined as a group of stars that appear to form a recognizable pattern or picture in the night sky when viewed from Earth.

These patterns were named by ancient cultures after mythological figures, animals, or everyday objects and used for navigation and storytelling.

Explanation

• Minor objects with irregular shapes orbiting the Sun are called asteroids,
• It is also known as a minor planet
• They are found mainly in the asteroid belt between Mars and Jupiter.

Explanation

Explanation

Neptune is the eighth and farthest planet from the Sun in our solar system.

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

• Neptune: ~165 Earth years
• Uranus: ~84 Earth years
• Saturn: ~29.5 Earth years
• Jupiter: ~12 Earth years
• Mars: ~687 Earth days (1.88 years)
• Earth: 365.25 days
• Venus: ~225 Earth days
• Mercury: ~88 Earth days 

Explanation

• Venus comes closest to Earth when it is between Earth and the Sun.

• Minimum distance: about 24 million miles (≈ 38 million km).

• This close approach occurs roughly every 584 days.

Additional Information:

• Mercury can be about 33 million miles away when Venus is on the far side of the Sun.

Last verified on 17-01-2026

Explanation

• Venus is the brightest planet in the night sky.
• Due to its thick cloud cover that reflects sunlight strongly.
• It is often called the “Evening Star” or “Morning Star.”

Additional information:

• Distance from Sun: ~108 million km
• Diameter: 12,104 km
• Orbital Period: 225 Earth days
• Atmosphere: Thick CO₂ clouds, very reflective

Last verified on 15-01-2026