Δευτέρα 21 Ιουλίου 2025
Astronomy Picture Of The Day: Walking on the moon...
Τετάρτη 9 Απριλίου 2025
Astronomy Picture Of The Day:Moonquakes Surprisingly Common
#NASA, #Apollo11Crew #NASA, #Space, #astronomy, #διάστημα,
Explanation: Why are there so many moonquakes? Analyses of seismometers left on the moon during the Apollo moon landings reveal a surprising number of moonquakes occurring within 100 kilometers of the surface. In fact, 62 moonquakes were detected in data recorded between 1972 and 1977. Many of these moonquakes are not only strong enough to move furniture in a lunar apartment, but the stiff rock of the moon continues to vibrate for many minutes, significantly longer than the softer rock earthquakes on Earth. The cause of the moonquakes remains unknown, but a leading hypothesis includes tidal gravity from -- and relative heating by -- our Earth. Regardless of the source, future moon dwellings need to be built to withstand the frequent shakings. Pictured here, Apollo 11 astronaut Buzz Aldrin stands beside a recently deployed lunar seismometer, looking back toward the lunar landing module.
https://apod.nasa.gov/apod/ap250406.html
Κυριακή 30 Ιουλίου 2023
Astronomy Picture Of The Day: Apollo 11: Catching Some Sun
#NASA, #Apollo 11 #Nebula #Space #Universe, #διάστημα
Explanation: Bright sunlight glints as long dark shadows mark this image of the surface of the Moon. It was taken fifty-four years ago, July 20, 1969, by Apollo 11 astronaut Neil Armstrong, the first to walk on the lunar surface. Pictured is the mission's lunar module, the Eagle, and spacesuited lunar module pilot Buzz Aldrin. Aldrin is unfurling a long sheet of foil also known as the Solar Wind Composition Experiment. Exposed facing the Sun, the foil trapped particles streaming outward in the solar wind, catching a sample of material from the Sun itself. Along with moon rocks and lunar soil samples, the solar wind collector was returned for analysis in earthbound laboratories.
https://apod.nasa.gov/apod/ap230729.html
Σάββατο 29 Ιουλίου 2023
Astronomy Picture Of The Day: The solar wind
The solar wind – a constant stream of particles and energy flowing from the Sun – was first theorized 65 years ago. But that doesn’t mean scientists have uncovered all its secrets. In fact, a fresh look at data from 12 NASA spacecraft is giving scientists a new perspective. pic.twitter.com/yGiKtTEgFq
— NASA Sun & Space (@NASASun) July 27, 2023
Κυριακή 23 Ιουλίου 2023
Astronomy Picture Of The Day: Apollo 11, Armstrong's Lunar Selfie
#NASA, #Apollo 11, #Neil Armstrong,#διάστημα, #space
Explanation: A photograph of Buzz Aldrin standing on the Moon taken by Neil Armstrong, was digitally reversed to create this lunar selfie. Captured in July 1969 following the Apollo 11 moon landing, Armstrong's original photograph recorded not only the magnificent desolation of an unfamiliar world, but Armstrong himself reflected in Aldrin's curved visor. In the unwrapped image, the spherical distortion of the reflection in Aldrin's helmet has been reversed. The transformed view features Armstrong himself from Aldrin's perspective. Since Armstrong took the original picture, today the image represents a fifty-four year old lunar selfie. Aldrin's visor reflection in the original image appears here on the left. Bright (but distorted) planet Earth hangs in the lunar sky above Armstrong's figure, toward the upper right. A foil-wrapped leg of the Eagle lander and Aldrin's long shadow stretching across the lunar surface are prominently visible. In 2024 NASA's Artemis II mission will return humans to the Moon.
https://apod.nasa.gov/apod/ap230722.html



