On this day · archive

Pluto names its small companions

June 21 carries archive, culture, disaster, law, space. A distant planet’s family album gains two names, turning faint points of light into entries the public can remember.

8

events in todayish file

Archive mapAll · 8Disaster · 3Space · 2Culture · 1Archive · 1Law · 1
Lead · Space · June 21 · 4 min

2006

Pluto's newly discovered moons are officially named Nix and Hydra.

A distant planet’s family album gains two names, turning faint points of light into entries the public can remember.

Pluto’s newly discovered moons are officially named Nix and Hydra: a small act of language at the far edge of the familiar solar system. Before a name, a moon is a measurement; after it, the public can begin to remember it.

The record is modest in scale and large in implication. Nix and Hydra do not make Pluto less distant, but they make its neighborhood more legible — two companions added to the map by naming.

On a day crowded with crashes, court doctrine, theater, spaceflight, and Andean scholarship, the Pluto entry offers the archive a quiet scientific verb: to notice, then to name.

An observatory desk with a model of Pluto, two small moons, star charts, and cool violet-blue light.
Nix and Hydra give the edge of the solar system a little more language, and language is how distant things enter public memory.

The full record

8 entries from the day’s archive, filed year by year with a note on what each one leaves behind.

Year by year
2025

A hot air balloon catches fire mid-flight and crashes in Praia Grande, Santa Catarina, Brazil, killing 8 of the 21 on board.

A balloon excursion becomes a fatal aviation disaster in Brazil, with the toll kept plainly in view.

Disaster

2012

A boat carrying more than 200 migrants capsizes in the Indian Ocean between the Indonesian island of Java and Christmas Island, killing 17 people and leaving 70 others missing.

Migration and maritime danger meet between Java and Christmas Island, leaving deaths and missing people in the record.

Disaster

2012

An Indonesian Air Force Fokker F27 Friendship crashes near Halim Perdanakusuma International Airport, killing 11.

The Fokker crash gives the same year a second disaster record, this one measured by airport proximity and eleven deaths.

Disaster

2006

Pluto's newly discovered moons are officially named Nix and Hydra.

Nix and Hydra turn remote discovery into public language at the edge of Pluto’s neighborhood.

Space

1993

Space Shuttle Endeavour is launched on STS-57 to retrieve the European Retrievable Carrier (EURECA) satellite. It is also the first shuttle mission to carry the Spacehab module.

The 1993 space entry measures distance and engineering through Space Shuttle Endeavour is launched on STS-57 to retrieve the European Retrievable Carrier EURECA.

Space

1978

The original production of Tim Rice and Andrew Lloyd Webber's musical, Evita, based on the life of Eva Perón, opens at the Prince Edward Theatre, London.

The 1978 culture entry begins with The original production of Tim Rice and Andrew Lloyd Webber's musical Evita based on, then depends on audiences to carry it forward.

Culture

1973

The Primer Congreso del Hombre Andino is inaugurated in Arica, Chile.

The Arica congress adds an intellectual and regional register to the day’s archive.

Archive

1973

In its decision in Miller v. California, 413 U.S. 15, the Supreme Court of the United States establishes the Miller test for determining whether something is obscene and not protected speech under the U.S. constitution.

The Miller decision gives the date a durable First Amendment test and a long legal afterlife.

Law