Explanation

• The Hubble Space Telescope is a joint project of NASA (USA) and ESA (European Space Agency).
• It was launched in 1990 into low Earth orbit.
• Scientists like John C. Mather contributed to its development and research.
• It is used for observing distant galaxies and space objects.

Last verified on 08-06-2026

Explanation

• Earth is the third planet from the Sun in our solar system.

The order of the planets starting closest to the Sun is:

1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune

Last verified on 27-09-2026

Explanation

• Saturn is famous for its prominent and beautiful ring system.
• Its rings are made mainly of ice particles, dust, and rock fragments.

Additional information:

• It is the second-largest planet in the Solar System.
• It is often called the “Ringed Planet.”
• Famous moon: Titan
• Orbital period: About 29.5 Earth years
• It is the sixth planet from the Sun.

Last verified on 27-09-2026

Explanation

• A parameter is a value used to describe or define a system, model, or function.
• It usually remains constant for a particular situation.
• Example: In (y = mx + c), m and c can be parameters.

Last updated: NA on 26-09-2026

Explanation

• Wavelength is the distance between successive wave crests.
• SI unit: Meter (m)
• Commonly measured in: Nanometers (nm) and Angstroms (Å)
• 1 nm = 10⁻⁹ m
• 1 Å = 10⁻¹⁰ m = 0.1 nm
• Visible light: Approximately 400–700 nm

Last updated: 20-09-2026 by NA

Explanation

• Astrology studies the supposed influence of stars and planets on human affairs.
• Origin: Ancient Mesopotamia (modern Iraq).
• Developed by: Sumerians and Babylonians.
• Period: Around the 3rd–2nd millennia BCE.

Explanation

• Ice is less dense than water, so it floats.
• Archimedes’ Principle explains the buoyant force acting on floating ice.
• The buoyant force acts upward against gravity.
• Formula: FB = p Vg
• Key point: An object floats when buoyant force = its weight.

Explanation

• Light Year is the distance that light can travel in one year.
• The distance light travels in one year is known as light year.
• 1 light year is equal to 9.5 x 10¹²km.

Last verified on 30-03-2026

Explanation

• A picosecond (ps) is equal to 10⁻¹² seconds.

Additional information:

• Millisecond = 10⁻³ second
• Microsecond = 10⁻⁶ second
• Nanosecond = 10⁻⁹ second

Last verified on 08-09-2026

Explanation

• Seismology is the study of earthquakes and seismic waves that move through and around the Earth.
• A seismologist is a scientist who studies earthquakes and seismic waves.

Last verified on 03-04-2026