It is 7, 214 miles from Washington, D.C., to Kigali, Rwanda, where Tom has gone on a business trip. In less than an hour it will be 7,800 miles — just a few hundred more — from Nasa’s New Horizons probe to Pluto.

Earth meets space, the Kuiper Belt, that which lies beyond our solar system in what surely deserves to be called terra incognita (except that it isn’t terra!).

Early pictures show an orange globe with a crown of methane and nitrogen ice and craters the size of the Grand Canyon. By tonight we will have more photographs of this celestial body, photographs that may help scientists decide whether to call it a planet or a dwarf planet.

What we have right now is a tantalizing glimpse, a collectively held breath — and of course, the wonder.