On November 18 of this year, a spacecraft called Voyager 1 reaches a distance nothing built by man has ever reached. Sixteen billion miles. At that range, light itself needs a full day to make the trip. If the team sends a command at noon on Monday, the spacecraft hears it at noon on Tuesday. If it answers right away, we hear back at noon on Wednesday. That is a conversation with a two day delay held with a machine that launched in 1977 and has not stopped moving since.

Here is what resets your sense of scale. Sixteen billion miles is the small number here. The closest star to our own sits about four and a quarter light years out. Voyager has been moving somewhere around thirty eight thousand miles an hour for almost fifty years and at that speed the trip to the nearest star would run something like seventy thousand years. Voyager is not even pointed at it.

The other thing nobody prepares you for is how empty it is. We call it space for a reason. Shrink the sun down to a basketball and Earth becomes a grain of sand about twenty five meters away. On that same scale, the next star over sits several thousand miles off. Everything between is nothing. Picture a box out there the size of your bedroom. Inside that entire box you would find maybe a few dozen atoms drifting around. That is all of it. The same box in your house holds more air molecules than there are grains of sand on every beach on Earth.

On Valentine's Day in 1990, about three and a half billion miles out, Voyager turned its camera around and took a picture of home. Earth came back as a point of light twelve hundredths of a pixel wide caught by accident in a stray beam of sunlight bouncing around inside the lens. NASA had resisted the idea for years because the photograph had no scientific value at all. Carl Sagan pushed for it anyway. He wanted it for a different reason. Every person who has ever lived, every war, every argument, every thing you are carrying into this weekend, all of it happened on that speck.

Then there is the other direction. Astronomers have a habit of aiming a telescope at a patch of sky that looks completely empty. It is a piece of dark about the size of a grain of sand held at arm's length, and they simply leave the shutter open. What comes back is not darkness. It is thousands of galaxies, each one holding hundreds of billions of stars sitting quietly in the part of the sky we had written off as nothing. The sky was never empty there. We just had not looked long enough to see it.

That is the whole thing. It is enormous and it is almost entirely empty. Every time somebody looks harder at a patch that seems empty, it turns out not to be. Some men read all that and feel small. Others read it and feel lucky. Which one you get usually depends on the week you have had.

None of this makes your life small. That is a lazy way to read this and it is wrong. What it changes is how much room you give things in your head. The email you have been avoiding is still real. The conversation you keep replaying at two in the morning is still real. They are also happening on a speck of light you would need a telescope to find. Both of those are true at once. Knowing the second one makes the first one easier to carry.

Voyager is still going. Nearly fifty years in, it has not slowed and it has not stopped once. In November, the light will finally take a full day to catch it.