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Three of the flights had flown above the Kármán line (edge of space), and one was intended to do so. In each of these accidents, the entire crew was killed. As of December 2023, a total of 676 people have flown into space and 19 of them have died. This sets the current statistical fatality rate at 2.8 percent.
On 15 September, the Firefly Alpha made its successful flight for a tactically responsive mission for the U.S. Space Force. [27] On November 18, 2023, SpaceX Starship attempted its second flight test, becoming the heaviest rocket to enter space, although the first stage exploded shortly after separation, while the second stage was lost nearly ...
This discovery was found in studies of UHZ1, a very early galaxy containing a quasar, by the Chandra X-ray Observatory and James Webb Space Telescope. [622] [623] 29 November. Astronomers report the discovery of a star, HD 110067, that contains six sub-Neptune exoplanets with radii ranging from 1.94R⊕ to 2.85R⊕. [624]
This is a list of lists of deaths of notable people, organized by year. New deaths articles are added to their respective month (e.g., Deaths in February 2025 ) and then linked below. 2025
Researchers demonstrate an open-brain surgery-free brain implant, Stentrode, that can record brain activity from a nearby blood vessel, showing it can be used to operate a computer. [19] [20] 10 January A second potentially Earth-like planet in the TOI 700 system is reported using data from NASA's Transiting Exoplanet Survey Satellite (TESS). [21]
This is a diffusing subcategory of Category:2023 in outer space. Articles about astronomical objects discovered in 2023 in the parent category should be moved to this subcategory. This category is for astronomical objects discovered in 2023 .
This list of exoplanets discovered in 2023 is a list of confirmed exoplanets that were first reported in 2023. For exoplanets detected only by radial velocity, the listed value for mass is a lower limit. See Minimum mass for more information. Name Mass (M J) Radius (R J) Period (days) Semi-major axis (AU) Temp. (K) Discovery method Distance (ly) Host star mass (M ☉) Host star temp. (K ...
The following is a list of notable deaths in January 2023. Entries for each day are listed alphabetically by surname. A typical entry lists information in the following sequence: Name, age, country of citizenship at birth, subsequent country of citizenship (if applicable), reason for notability, cause of death (if known), and reference.