Launches
ON RECORD25MISSIONS
24 of them reached orbit. The earliest was 1964, the most recent 2026.
ARCHIVE // DAY OF YEAR
25 orbital launches flew on April 4, the earliest of them in 1964, and 24 reached orbit. Wikipedia records 5 spaceflight and astronomy events on April 4. Below are the pictures NASA published on April 4 in 6 different years — each one taken or released on this exact date.
25MISSIONS
24 of them reached orbit. The earliest was 1964, the most recent 2026.
5ENTRIES
Spaceflight and astronomy entries from Wikipedia's record of this date, oldest first — from 1968 onward.
6IMAGES
NASA's Astronomy Picture of the Day for April 4, one per year. Some are public domain and some belong to the photographer — each says which.
NASA’s Astronomy Picture of the Day, for this calendar date in each of the last several years.

2026
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain

2025
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
© Robert Nemiroff — used with the credit NASA publishes

2024
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
© Dan Bartlett — used with the credit NASA publishes

2023
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain

2022
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain

2021
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain
1975
Vietnam War: A United States Air Force Lockheed C-5A Galaxy transporting orphans, crashes near Saigon, South Vietnam shortly after takeoff, killing 172 people.
Vietnam War ↗1983
Space Shuttle program: Space Shuttle Challenger makes its maiden voyage into space on STS-6.
Space Shuttle program ↗1996
Comet Hyakutake is imaged by the USA Asteroid Orbiter Near Earth Asteroid Rendezvous.
Comet Hyakutake ↗1997
Space Shuttle program: Space Shuttle Columbia is launched on STS-83. However, the mission is later cut short due to a fuel cell problem.
Space Shuttle Columbia ↗General-audience astronomy and spaceflight — none of it a textbook.
As an Amazon Associate I earn from qualifying purchases. Links here cost you nothing extra.
LISTING
Still the best single argument for why any of this matters, and it leaves the arithmetic in. For a reader who wants the science, not just the awe.
LISTING
The case for leaving Earth, written by someone unsentimental about how hard that is. Suits readers who want the argument rather than the poster.
LISTING
Hard-SF problem solving in The Martian's key — for anyone who liked the engineering more than the peril. The only novel on this list.
BROWSE opens an Amazon search, not a specific recommendation.
LINKS AMAZON.COM
Event text and thumbnails come from Wikipedia and are used under CC BY-SA 4.0. Images are drawn only from Wikimedia Commons, which does not accept non-free content — each thumbnail links to its file page, where its licence and author are recorded.
Launch records are from The Space Devs’ Launch Library 2. Pictures are NASA’s Astronomy Picture of the Day; NASA imagery is generally not subject to copyright, but individual APOD entries are frequently the property of the photographer, and each caption says which applies.