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What were our early ancestors thinking as they gazed up at the night sky?

Were they curious as to what the heavens had to hide?

By A B ForbesPublished 2 months ago 3 min read
Photo by Robson Hatsukami Morgan on Unsplash

British spelling.

Now it is very different as we have developed sophisticated telescopes and other specialised scientific instruments that are helping to reveal some of the secrets the Universe holds.

Photo by Gontran Isnard on Unsplash.

Scientists believed that the Universe came into existence roughly 13.8 billion years ago.

Two trillion is one estimate for the number of galaxies that are spread throughout that gargantuan area we call the Universe.

The number of stars in our galaxy the Milky Way is usually stated at over 100 billion, but many experts believe that there could be 200 billion or maybe more.

We now know for sure that the vast majority of stars will have orbiting planets, as you probably know our local star system has the Sun at its centre, with 8 orbiting planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and the most distant planet Neptune, and of course all the other countless celestial objects that make up our Solar System.

If we use the 200 billion stars estimate and give every star in the Milky Way an average of just two planets, that would add up to roughly 400 billion planets, considering that the Sun has 8 orbiting planets, I don't think that the estimated number of planets is too unreasonable.

The Earth orbits the Sun in the goldilocks zone or habitable zone where water can be in three well-known states, liquid, solid and gas, perfect for the existence of life as we know it.

Venus and Mars are also in the goldilocks zone but there is no doubt which planet has the best conditions for life to exist and flourish.

Image by mdherren from Pixabay.

Luckily our world happens to be at the perfect distance from the Sun, a bit closer to the Sun and the water would boil away, a bit further from the Sun and all the water would be frozen solid.

Imagine how many planets there must be in our galaxy that are orbiting stars in the habitable zone, there must be trillions of them. We cannot yet say for sure if any of them harbour intelligent life or even primitive life, but surely, it would be unreasonable to think that life got a start on only one planet, namely the Earth.

As of now we only know of one place in our Solar System that harbours life, but, could it be possible that there is primitive life on a planet or moon in our own star system, we might even get proof of past life as we study our neighbouring planets and moons.

Hopefully, in the future, we will get a definite answer to that very important question "are we alone in the Universe"

End of the main article.


The Sun took a long time to form, as its mass and size increased the temperature in its core eventually reached 15 million degrees Celsius, which is the temperature needed for nuclear fusion to start. That was when the hot ball of plasma we call the Sun began to shine brightly. We could say the Sun is middle-aged as it will burn hydrogen in its core for an estimated 5 billion years more.

The Earth is younger than the Sun it is estimated to be about 4.5 billion years old.

Simple life forms were living on our planet almost 4 billion years ago, since that time billions of animal species have existed, and millions of species are still alive today.

The evolutionary path for life has been long but at last, we have arrived. Our highly developed brain has given us intelligence and curiosity, now we can try and make sense of the Universe and our existence.


You might find some of my articles of interest. They are written in layman's terms. We are not all experts! Enjoy.


About the Creator

A B Forbes

I hope you find some of my articles interesting.

Our highly developed brain has given us intelligence and curiosity, now with the help of sophisticated scientific instruments, we can try and make sense of the Universe and our existence.

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Nice work

Very well written. Keep up the good work!

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Comments (3)

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  • Cathy holmes3 days ago

    Wonderful, interesting article. Well done.

  • This is full of interesting things, I really enjoyed going through and as you know I am no expert at anything so a perect audience for you

  • Author. My articles are written for people with an average understanding of the universe and life. We are not all experts. I hope you gain some knowledge if you decide to read them. Regards.

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