This is the Artemis II commemorative launch postmark that was (and I believe still is) available from the USPS. I got this one from the Cape Canaveral "Astronaut Blvd" post office and had it datestamped April 1: launch day. I previously received a cover with the Artemis II Mission Control postmark which also turned out well.
From the Geneva office. The two stamps are from a 2007 set of three and a souvenir sheet, with three different issues across the three UN offices. They commemorate 50 years of achievements in space, declaring space for humanity.
During the recent Artemis II moon mission a couple of commemorative postmarks were made available from the USPS. I got this one from the Hadley Street Post Office in Houston, Texas. It shows the Orion capsule Integrity against the moon with the flight controllers back at Houston Mission Control. I had it datestamped April 6: the day Integrity came within 6500km of the lunar surface.
This is the third cover I've received from Brazil with solar system stamps on it. I think I'm one short of a whole sheet. On these stamps are Saturn, Neptune and Uranus. And in the label are asteroids Ceres and Hijra.
More 2020 solar system stamps from Brazil. From left to right: the sun, Venus and Jupiter.
This cover from the Brazilian coastal city of Florianopolis comes to me with three stamps from a sheet of nine from 2020 that feature celestial bodies from our solar system. From left to right, the Sun, Earth and Mars. It's hard to see but the dark lines in the stamps that trace the paths of the planets around the sun are highlighted with a varnish.
Some OSIRIS-REx asteroid sample return stamps from 2023 decorate this tidy cover from Alaska.
The contractor-operated post office at the Kennedy Space Center in Florida ceased operations on the 26th of September, 2023. There has been a post office at the KSC in one form or another since 1965. I would guess that most of its customers were space cover collectors. Near the bottom of this thread it mentions there were 663 items hand cancelled on closing day. I found out about the closure at the last minute and managed to get this cover down there for cancellation on the last day.
The 74 inch reflector telescope at the David Dunlap Observatory in Richmond Hill Ontario was, for a brief time, the second largest telescope in the world and is still the largest telescope in Canada. The observatory went into service in 1935 and was operated by the University of Toronto until 2008. The City of Richmond Hill maintains the site now, mostly for it's historical significance. Light pollution from encroaching urban sprawl put an end to scientific research at the observatory a long time ago. Today there are homes within 200m of the telescope.
I had this datestamped with January 20th, 2023 which was the first ISS Extra Vehicular Activity (EVA) of 2023. During their 7+ hour spacewalk astronauts Koichi Wakata and Nicole Mann installed solar array mounting brackets.
Launched on 25 December 2021, the James Webb Space Telescope obits the Sun approximately 1.5 million kms from the Earth. It uses it's large mirror array to capture visible to infra-red light allowing it to see further into space than any telescope before it.
Perseverance landed on Mars on 18 February 2021. The postmark even has a little image of the robotic helicopter Ingenuity in the upper right corner which completed its second successful flight yesterday.
Postmark commemorating the launch of NASA's latest Mars mission. Launched on 30 July at 11:50 UTC, the Perseverance rover and an autonomous helicopter drone called Ingenuity are scheduled to land on Mars on February 18th, 2021.
