Gravity

  • Ocean tides are caused by the gravity of the moon.
  • Mars is smaller and has less mass than Earth. As a result it has less gravity. If you weigh 100 pounds on Earth, you would weigh 38 pounds on Mars.
  • The standard gravity from Earth is 1 g force. When riding a roller coaster you may feel a lot more g forces at times. Maybe as much as 4 or 5 g’s. Fighter pilots or astronauts may feel even more.
  • At some point when falling, the friction from the air will equal the force of gravity and the object will be at a constant speed. This is called the terminal velocity. For a sky diver this speed is around 100 miles per hour.
  • Pluto may no longer be a planet, but it’s still a good bet for lightening up. A 150-pound (68 kilogram) person would weigh no more than 10 pounds (4.5 kg) on the dwarf planet.
  • The planet with the most crushing gravity is Jupiter, where the same person would weigh more than 354 pounds (160.5 kg).
  • Some bacteria become nastier in space. Sciences found that salmonella, the bacteria that commonly causes food poisoning, becomes three times more virulent in microgravity.

Gravity

Gravity is the mysterious force that makes everything fall down towards the Earth. Gravity is a force which tries to pull two objects toward each other. Anything which has mass also has a gravitational pull. It turns out that all objects have gravity. The more massive an object is, the stronger its gravitational pull is (like the Earth and the Sun, have a lot more gravity than others).Earth’s gravity is what keeps you on the ground and what causes objects to fall. Gravity is what holds the planets in orbit around the Sun and what keeps the Moon in orbit around Earth. The closer you are to an object, the stronger its gravitational pull is. Gravity is what gives you weight. It is the force that pulls on all of the mass in your body.

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Gravity between Earth and Moon

Is gravity important?

Gravity is very important to our everyday lives. Without Earth’s gravity we would fly right off it. We’d all have to be strapped down. If you kicked a ball, it would fly off forever. While it might be fun to try for a few minutes, we certainly couldn’t live without gravity.

Gravity also is important on a larger scale. It is the Sun’s gravity that keeps the Earth in orbit around the Sun. Life on Earth needs the Sun’s light and warmth to survive. Gravity helps the Earth to stay just the right distance from the Sun, so it’s not too hot or too cold.

Gravity was first mathematically described by the scientist Isaac Newton. His theory is called Newton’s law of universal gravitation. Later, Albert Einstein would make some improvements on this theory in his theory of relativity.

So, now we know what exactly is gravity. To learn some of the fun facts about gravity see-

Gravity

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The Solar System

The Solar System is the gravitationally -bound system comprising the Sun and the objects that orbit it, either directly or indirectly.

Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies.

And those that orbit the Sun indirectly, the moons, two are larger than the smallest planet, Mercury.

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We know that the Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. (see – How was the Earth born)

Our Solar System consists of (mass distribution within Solar System given in bracket) –

  • Sun: 99.85%
  • Planets: 0.135%
  • Comets: 0.01%
  • Satellites: 0.00005%
  • Minor Planets: 0.0000002%
  • Meteoroids: 0.0000001%
  • Interplanetary Medium: 0.0000001%
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The planets in the Solar System

So now we know about the Solar System. Do you want to learn more about the solar system and the other plants? Yes, then visit our other Posts.

 

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The making of Sun

The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasmawith internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth.

sun

The Sun – Center of Solar System

Its diameter is about 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System.

About three quarters of the Sun’s mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.

Scientists believe that the solar system was formed when a cloud of gas and dust in space were disturbed, maybe by the explosion of a nearby star (called a supernova). This explosion led to the formation of waves in space which squeezed the cloud of gas and dust. Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula. Just like a dancer that spins faster as she pulls in her arms, the cloud began to spin as it collapsed. Eventually, the cloud grew hotter and denser in the center, with a disk of gas and dust surrounding it that was hot in the center but cool at the edges.

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Stages of Star formation (The Sun)

As the disk got thinner and thinner, particles began to stick together and form clumps. Some clumps got bigger, as particles and small clumps stuck to them, eventually forming planets or moons . Near the center of the cloud, where planets like Earth formed (read – How was the Earth born), only rocky material could stand the great heat. Icy matter settled in the outer regions of the disk along with rocky material, where the giant planets like Jupiter formed. As the cloud continued to fall in, the center eventually got so hot that it became a star, the Sun, and blew most of the gas and dust of the new solar system with a strong stellar wind.

So now we know that the Sun played a very important role in formation of the Solar System. Do you want to learn more about the solar system and the other plants? Yes, then visit our next blog –

The Solar System

 

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How was the Earth born

How the Earth Was Formed

Earth, also known as the World or the Globe, is the third planet from the Sun (see – The making of Sun) and the only one in the Universe to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets.

The formation of the Earth and other planets stars took a long time to be be born. Early in our universe’s history, the Earth– and other planets – was formed from dust, pieces of rock and gas orbiting the Sun. The gravity of the Sun helped to flatten these left overs into a disk and start to fuse them together. This created the solid bodies which would later make up the planets. Over time these solid bodies would collide creating even bigger masses. It was in this method that the Earth was eventually formed.

formation

How the Earth was formed

Some of the materials in this mass were heavier than others. Fusion eventually created heavier elements such as carbon and iron. These elements were to compose a significant part of young Earth.The heavier metals fell to the center to become the Earth’s core. The rest of the materials became the mantle, crust and atmosphere.

So you must be thinking, what is the core, mantle, crust and atmosphere of the Earth?

EarthStructure

Layers of the Earth

The formation of the Earth was only the beginning and we still see the Earth changing year by years through erosion and plate tectonics. However in learning more about the formation of the Earth we are able to better understand what makes life possible on our planet.

So now we know that the Earth formed after the Sun. Do you know how the Sun was born? No, then this will surely be our next post –

The making of Sun

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Why Science Xplode ?

We here at Science Xplode aim at enlightening the young explorers or scientists with the various hidden secrets of Science.

Young kids are very keen on learning about new things. They usually don’t hesitate to ask questions regarding what’s and why’s of anything. Many adults get puzzled by their questions. Children don’t know whom exactly to ask the questions. So we are ready to explode along with you the secrets behind science.

We believe kids to be the natural scientists, just a bit of guidance and support and you never know what they come up with.

The important thing is not to stop questioning. Curiosity has its own reason for existing.

                                                                                                    – Albert Einstein