2021 TP21 is an Apophis-sized asteroid that was discovered on 11 October 2021 when it was 0.5 AU (75 million km) from Earth. This potentially hazardous...

2022-01-11. "Archive esa Risk List with 2021 TP21". Archived from the original on 2021-10-31. "JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty...

significant events in science that have occurred in the first quarter of 2021. 1 January – Beginning of the implementation of Plan S, an initiative for...

2021 DW1 is a small Apollo near-Earth asteroid discovered on 16 February 2021 by the Pan-STARRS 1 survey at Haleakala Observatory, Hawaii. On 4 March...

2021 AV7 is a near-Earth asteroid of the Apollo group, discovered by astronomers Alain Maury and G. Attard at San Pedro de Atacama, Chile on 15 January...

Earth during 2021. "2021 SG". Minor Planet Center. International Astronomical Union. Retrieved 11 December 2021. "MPEC 2021-S24 : 2021 SG". Minor Planet...

significant events in science that have occurred in the second quarter of 2021. 2 April – Scientists report that the event that caused the mass-extinction...

Earth approach on 31 December 2021 at distance of about 10 million km. 2021 TP21 2022 BX1 Earth traveling at 30 km/s and with a diameter of 12,800 km,...

significant scientific events that occurred or were scheduled to occur in 2021. 1 July Construction begins on the Square Kilometre Array, with first light...

1.493 lunar distances (574,000 km; 357,000 mi) from Earth on 9 November 2021 at 03:48 UTC, after which observations were checked by the International...