Category Nature Science & Wildlife

What are reptiles?

About 300 million years ago, some amphibians changed into reptiles. They could live on land all the time. Reptiles have backbones and scaly skin, and most lay eggs. Many reptiles, such as crocodiles, spend lots of time in the water, but they can’t breathe underwater. They use the Sun to keep their bodies warm.

Is it true? Some early reptiles had sails, on their backs.

Yes. Dimetrodon had a skin ‘sail’ on its back. It soaked up the Sun’s heat, and controlled the animal’s body temperature.

Amazing! A small animal found in Scotland, in rocks that are 350 million years old, might be one of the first reptiles. But some scientists say it was an amphibian.

What did reptiles eat?

The first reptiles, such as Hylonomus, were small lizard-like animals that ate tiny creatures. Reptiles learned how to run quickly so they could catch fast-moving insects. As reptiles became larger, they caught and ate bigger prey, including other reptiles. Some reptiles only ate plants.

Which reptiles had fur?

Some prehistoric reptiles grew fur on their bodies to keep themselves warm. These were the cynodonts. They lived about 245 million years ago. Over time they changed into a completely new group of animals, called mammals.

Picture Credit : Google

When and where did life on Earth begin?

Life on Earth began about 3.5 billion years ago. The first life appeared in the sea. It was born into a world that looked very different from today. The atmosphere was filled with poisonous gases. The sky was pink, and the sea was rusty-red.

Is it true? Earth is the only planet with life on it.

Maybe. This is one of the greatest unsolved mysteries. Life probably does exist on other planets besides Earth, but nothing has been found so far. The search continues.

How did life begin?

It is thought that life began when lightning hit the sea. Lightning sent energy into the water. Chemicals in the sea were mixed together by energy. New substances, called amino acids, were made, from which life was able to grow.

Amazing! The first living things on Earth were so small you could fit thousands of them on the head of a pin.

What were the first living things?

The first living things were bacteria. They lived in the sea. Some bacteria changed into algae, which were simple plants. Algae lived in the sea in masses, like huge blankets. They made oxygen, which helped to turn the sky and sea blue.

Picture Credit : Google

When did life first appear on land?

About 440 million years ago, the first life appeared on land. It was simple plant life, similar to today’s mosses. Then, about 400 million years ago, the first land animals -worms, spiders, scorpions and insects – evolved as they moved on to the land.

Is it true? There are no amphibians alive today.

No. There are many different amphibians in the world today. Frogs, toads and salamanders are all amphibians.

Why did some fish grow legs?

Some fish began to live in shallow water. It was difficult to swim in the shallows. To help these fish move around they grew short legs. Some of them also grew lungs, which meant they could breathe air. These animals could live in water and on land.

Amazing! The lungfish is one of today’s fish that can live out of water. It can breathe air.

Which animal lives in water and on land?

An animal that can live in water and on land is called an amphibian. It means ‘double life’. The first amphibians appeared by 350 million years ago. Gradually, they spent more and more time on land.

Picture Credit : Google

How old is the Earth?

Earth is millions and millions of years old. In fact, our planet is four-thousand-six-hundred-million years old. When the Earth’s age (4.6 billion years) is written as a number, it looks like this: 4,600,000,000. It’s hard for us to imagine anything so old.

Has there always been life on the Earth?

Nothing at all lived on the Earth for the first billion (1,000 million) years of the planet’s existence. The conditions were not right for life. There were no plants or animals of any kind. Earth was a dangerous place where life could not survive.

Amazing! Some of Earth’s oldest known rocks are found in Scotland. They are about 3.5 billion years old.

Has the Earth always looked the same?

These maps show how Earth’s land and sea looked in the past. To fit everything on them, Earth has been drawn as an oval. For a long time, all land was joined together in one giant mass. Over millions of years it broke up into smaller pieces. They turned into today’s continents.

Is it true? The continents are still moving.

Yes. The continents move about 4 centimetres each year – the length of your little finger. Millions of years in the future, Earth will look very different from today.

Picture Credit : Google

COULD SCIENCE FICTION STORIES EVER COME TRUE?

Science fiction stories do come true all the time. Less than a hundred years ago, space travel was a fantasy invented by storytellers such as H G Wells and Jules Verne. When we consider the extraordinary advances made in the fields of travel and communications in the past century, it is tempting to believe that Star Trek may in the future be nearer to reality than at present seems possible!

Science fiction introduces us to elaborate, futuristic worlds that often sound like nothing more than a dream. But humanity has made incredible technological advancements over the past 100 years, and many of the ideas predicted in science fiction have now become reality.

Some predictions, like self-driving cars, are still in the early stages, but scientists and engineers have reached many other milestones first described in fiction, such as bringing people to the moon.

In 1865, author Jules Verne released From Earth to the Moon, which described three Americans’ mission to launch a spacecraft and land on the moon. Parts of the novel were similar to the first real moon landing, which occurred 104 years later.

Both the NASA astronauts and Verne’s characters launched from Florida. NASA’s command module was named Columbia in another similarity to Verne’s fictional spacecraft, the Columbia. NASA astronauts Neil Armstrong and Edwin “Buzz” Aldrin succeeded in walking on the lunar surface in 1969 while Michael Collins remained in the spacecraft. The three men in Verne’s novel, however, never stepped foot on the moon.

NASA has acknowledged other similarities between Apollo 11 and Verne’s novel as well. For example, the space agency said the Columbiad’s shape and size closely resembled the Apollo spacecraft. The novel also claimed a telescope would be able to see the Columbiad mission’s progress. When an explosion caused a malfunction during the Apollo 13 mission in 1970, a telescope at Johnson Space Center was able to see the accident, which took place more than 200,000 miles away (300,000 kilometres).

3D holograms have been featured in sci-fi for decades. In 2017, an Australian company claimed it has managed to produce a hologram table that resembles the futuristic holograms from the original “Star Wars” movie. Princess Leia called for Luke Skywalker’s help using a holographic message in the 1977 “Star Wars” movie. Since then, scientists have worked on turning this technology into reality.

Euclideon, an Australian company, says it has made the first multi-user hologram table in the world. As many as four people can interact with the hologram at once using motion-tracking glasses. Though Euclideon’s invention has been met with some scepticism, but New Atlas reported in November 2018 that the company is moving forward with bringing the hologram technology to market.

“Star Trek” featured replicators that could 3D print food and everyday objects in a few seconds. Scientists are now using 3D printing technology to make objects out of plastic, metal, and glass, though the process is not nearly as fast.

The New York-based nonprofit Mattershift says it has developed carbon nanotube membranes that could separate and put together individual molecules.

Forbes reported that Mattershift CEO Rob McGinnis says the membranes could help scientists make anything out of a set of basic molecular building blocks. “We’re talking about printing matter from the air,” McGinnis said, according to Forbes. “Imagine having one of these devices with you on Mars. You could print food, fuels, building materials, and medicines from the atmosphere and soil or recycled parts without having to transport them from Earth.” In addition, startups like Natural Machines are working on making 3D food printers commercially available.

The Iron Man suit has become legendary since first appearing in Marvel Comics. People won’t be flying around in suits anytime soon, but the US military is developing high-tech suits that will mirror some of Iron Man’s capabilities. The military’s TALOS program – short for Tactical Assault Light Operator Suit – aims to enhance human combat.

TALOS will take in huge amounts of data from drones, naval sensors, and reconnaissance aircraft to better inform soldiers, Military Times reported. The suit is expected to be light and include life support systems that will track soldiers’ vitals. 3D sound pickups built into the suit will also help soldiers figure out where incoming fire and vehicles are coming from.

WHAT ARE THE MAIN PROBLEMS OF SPACE TRAVEL?

The biggest problems of space travel all have to do with the enormous distances that are involved. Using today’s technology, it would take years to reach even the nearest planets, and generations of space travellers would live and die on a journey to more distant ones. For this to happen, spacecraft will need to be self-supporting or able to travel faster than the speed of light.

The first hazard of a human mission to Mars is also the most difficult to visualize because, well, space radiation is invisible to the human eye. Radiation is not only stealthy, but considered one of the most menacing of hazards.

Above Earth’s natural protection, radiation exposure increases cancer risk, damages the central nervous system, can alter cognitive function, reduce motor function and prompt behavioral changes. To learn what can happen above low-Earth orbit, NASA studies how radiation affects biological samples using a ground-based research laboratory.

Mars is, on average, 140 million miles from Earth. Rather than a three-day lunar trip, astronauts would be leaving our planet for roughly three years. While International Space Station expeditions serve as a rough foundation for the expected impact on planning logistics for such a trip, the data isn’t always comparable. If a medical event or emergency happens on the station, the crew can return home within hours. Additionally, cargo vehicles continual resupply the crews with fresh food, medical equipment, and other resources. Once you burn your engines for Mars, there is no turning back and no resupply.

Planning and self-sufficiency are essential keys to a successful Martian mission. Facing a communication delay of up to 20 minutes one way and the possibility of equipment failures or a medical emergency, astronauts must be capable of confronting an array of situations without support from their fellow team on Earth.

The variance of gravity that astronauts will encounter is the hazard of a human mission. On Mars, astronauts would need to live and work in three-eighths of Earth’s gravitational pull for up to two years. Additionally, on the six-month trek between the planets, explorers will experience total weightlessness. 

Besides Mars and deep space there is a third gravity field that must be considered. When astronauts finally return home they will need to readapt many of the systems in their bodies to Earth’s gravity. Bones, muscles, cardiovascular system have all been impacted by years without standard gravity. To further complicate the problem, when astronauts transition from one gravity field to another, it’s usually quite an intense experience. Blasting off from the surface of a planet or a hurdling descent through an atmosphere is many times the force of gravity.