One mono galaxy combine with another mono galaxy leads to ------> binary galaxy.
One mono galaxy combine with 2 mono galaxy leads to------->tertiary galaxy.
The Earth as viewed by Satellite in the atmosphere. At close view, you can see the trees, mountains, oceans and patches of clouds. At the top of the picture, you can see distant stars in the milky way galaxy.
The Earth and its moon. Notice the dust (interplanetary dust) surrounding our planet. Before earth was formed million of years ago, these dusts were floating in space until a strong nuclear fusion occured generating gravity that binds these dusts into a round ball known as planet.
The solar system consists of the sun (star) and all the orbiting planets from Mercury to Pluto.
1 Solar System = 1 Star (Sun) + all orbiting planets.
Not just one round planet was formed, but many planets (including asteroids, comets etc) were formed by the same method mentioned above. Because the sun (star) has a much larger gravity, all the planets orbit around the sun. 99% of the weight of the solar system is located in the sun and the other 1% comes from all the planets from mercury to pluto.
1 Galaxy ( Milky Way Galaxy) = billions of solar system.
1 solar system = 1 star (sun) + all its orbiting planets.
How many stars are there in one galaxy? (billion of stars)?
In our solar system, 1 sun (star) has 9 orbiting planets. In our galaxy, billions of stars must have thousands of billions of planets)?
Could there be aliens in these multitudes of planets?
Why can't we see these aliens?
The picture of our milky way spiral galaxy. Notice how many tiny specks of bright light. Each speck represents a sun (star). Each speck of sun has several orbiting planets. Imagine how many planets in our milky way galaxy?
There is three large galaxies in the picture. Each galaxy has as many stars (suns) and planets as our very own milky way galaxy.
Just how many galaxies are there in the universe?
If you are still pondering how many galaxies there are in the universe, look at the specks of bright light.
can you count them? Maybe?
Imagine how many stars+planets per light or galaxy.
Imagine how many planets in this picture.
If you think that you can outsmart the top picture, try this one. When each tiny dot represents one galaxy, how many galaxies can you count?
If you still think that you can count the number of specks of light in the top picture, try to imagine how big our universe is??
How big is our universe?
What you see in the top picture is only a tiny part of the universe. ( the lens area of a powerful telescope.)
Just how further deep can you preceive?
Just what is the maximum height, maximum width of the universe?
Does it have a shape? An egg shape? a square shape?
Ever wonder what the dark matters between galaxies are? Are they galactic oceans? Does the galaxies represent islands?
These galactic islands float on space. You can imagine the density of the spacious dark matter, and each galaxy suspends in them according to their gravity.
How heavy is an average human? How many humans are on earth? Why is earth suspended on space? Why is earth not falling down to the bottom of the 'bottomless-ever-expanding universe'?
Why spaceman floats on space? (one tiny human is not as heavy as earth)
Modern astronomy defines universe as no boundary and expanding.
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