Explanation

• Mars is known as the Red Planet due to its reddish appearance.
• Its surface contains iron oxide (rust) which gives it a red color.
• It is the 4th planet from the Sun in the solar system.
• Mars has two small moons: Phobos and Deimos.
• Mars is often called the “planet of future exploration”.

Last verified on 12-06-2026

Explanation

• The largest planet in our solar system is Jupiter.
• 5th planet
• 79 known moons (Maximum number of moons)
• The Great Red Spot is a prominent feature
• Giant planet and the fastest-rotating planet 
• Rotates approximately once every 10 hours.
• Age is about 4.603 billion years.

Additional information

• Mercury is the smallest planet of the solar system.

*****

Last updated by NA on 25-April-2026

Explanation

• Planet: Uranus
• Type: Ice Giant
• Temperature: Around −224°C (coldest recorded)
• Position from Sun: 7th planet
• Composition: Hydrogen, helium, methane
• Discovered: William Herschel in 1781

Last verified on 16-05-2026

Explanation

• Sun mass → 1.989 × 10³⁰ kg
• Earth mass → 5.972 × 10²⁴ kg
• Sun ≈ 330,000 Earths
• Sun contains 99.8% of solar system mass
• Earth is only 0.2% of total system mass (approx.)

Last verified on 02-05-2026

Explanation

• Phosphorus (P), Potassium (K), and Nitrogen (N) are three essential macronutrients for plant growth.
• It is also referred to as "NPK".
• They play critical roles in various plant processes, including photosynthesis, root development, and cell growth.

Last verified on 17-03-2026

Explanation

• A solid has both a definite shape and a definite volume.
• The particles in solids are tightly packed and only vibrate in fixed positions.
• Examples include iron, wood, stone, and ice.

Additional information:

• A liquid has a definite volume but no definite shape.
• A gas has neither definite shape nor definite volume.

Explanation

• Freezing is the process by which a liquid changes to a solid.
• It is the reverse of melting, which is the process by which a solid changes to a liquid.

Last verified on 13-03-2026

Explanation

• The invention of the Lever is attributed to Archimedes.
• The lever was first described in 260 B.C.E. by Archimedes.

Last verified on 13-03-2026

Explanation

• The freezing point of water is 0°C (32°F), where water changes from liquid to solid.
• The melting point is also 0°C, where ice changes from solid to liquid.
• Freezing and melting are opposite processes occurring at the same temperature.

Last verified on 13-03-2026

Explanation

• Liquids have no fixed shape but have a fixed volume.
• Particles are close together but can slide past each other, allowing the liquid to flow.

Additional information:

• Solid: Are tightly packed and stay in a fixed position
• Gas: Are widely spaced and move freely in any direction

Last verified on 13-03-2026