Explanation

• Venus and Mercury are the only planets in the solar system that do not have any natural satellites or moons.
• Likely due to their proximity to the Sun and gravitational influences.

Explanation

• The Soviet Union launched the first artificial satellite in space.
• It named Sputnik 1, on October 4, 1957.

Explanation

Objects that orbit around a planet are called satellites.

These can be natural, like the Moon, or artificial, like communication satellites.

Explanation

• The asteroid belt is a region of space where many small rocky bodies, called asteroids, orbit the Sun.
• It's also known as planetoids or minor planets.
• It is located between the orbits of Mars and Jupiter, spanning from about 2.2 to 3.2 astronomical units (AU) from the Sun.

Explanation

اپنے منہ میاں مٹھو بننا ایک ضرب المثل ہے جس کے معنی ہیں اپنی تعریف خود کرنا

Explanation

A free-falling object has an acceleration of 9.8 m/s/s, downward 

Explanation

The Milky Way is the galaxy that contains our solar system

It consists of 100–400 billion stars

The Milky Way is a huge collection of: 

• stars
• dust
• gas

It is visible as a hazy band of white light

Additional Information

The nearest galaxy to our Milky Way is Andromeda

Largest galaxy in the Universe is a Spiral galaxy 

Explanation

The sun is containing 99.86 % mass of the solar system

Explanation

Light from Sun travels a distance of  150 Million km before it reaches Earth

Explanation

Hydrogen and helium, the lightest two gases,

Hydrogen is a chemical element

It is colorless, odorless, tasteless, non-toxic, and highly combustible. 

Symbol: H

Atomic mass: 1.00784 u

Atomic number: 1

Atomic mass : zero

Boiling point: -252.9 °C

Discoverer: Henry Cavendish