The Edge of the Sky: All You Need to Know About the All-There-Is by Roberto Trotta

Author:Roberto Trotta [Trotta, Roberto]
Format: epub, pdf
ISBN: 9780465044900
Publisher: Perseus Books, LLC

In the time it takes you to blink, the number of dark matter drops that fly through your hand is two times the number of people living today in the city that never sleeps.

They imagine that dark matter is a new type of drops, which are of a different kind from the matter you and I are made of.

Dark matter drops are thought to be part of a large group of drops called Mirror Drops—a type of drops no one has seen yet. Student-people believe that for each type of normal drop we know about, there should be a type of Mirror Drop that goes with it.

Mirror Drops are believed to be the same as normal drops in almost all ways, except for two: Mirror Drops are much heavier than normal drops and have a different relationship with their own kind. This would explain why we haven’t found them yet.

Normal drops are grouped into two families. In one, drops love to hang around with drops of the same family and try to get together as much as they can. In the other, drops do not like having family around and do their best to keep themselves to themselves.

Mirror Drops also come in two families, except that their family relationships are the other way around: if a normal drop loves family, its Mirror Drop will avoid it; and the other way around.

This is like when you look at yourself in the mirror: what you see staring back looks almost the same as you, except it is flipped.

Mirror Drops could live early after the Big Flash, because everything was hot then and the heavy Mirror Drops could only come to life in hot places. But when everything cooled down, the Mirror Drops broke down into lighter and lighter drops, until only the lightest drop remained. This is what we call dark matter.

Dark matter is made up of the last remaining Mirror Drops from the Big Flash.

And it is all around us.

In the time it takes you to blink, the number of dark matter drops that fly through your hand is two times the number of people living today in the city that never sleeps.

This might be hard to believe. If there are so many dark matter drops, how come we do not feel them?

In fact, we spend our lives sitting in a dark matter rain, but we never get wet.

The normal drops we are made of do not feel dark matter drops most of the time. This is because dark matter drops can kick normal matter only slightly, and only once in a while.

Most of the time, dark matter flies through without leaving any trail.

But if we listen very carefully, we might be able to pick up the quiet whisper of dark matter.

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