Dominic Stone
International Astronomy Day is celebrated twice a year, once in the spring and once in the fall, to celebrate the changing constellations and various things to observe in space at different times of the year. The day was started in 1973 by Doug Berger, then president of the Astronomical Association of Northern California, to make space more accessible to everyone. It is a day for astronomy enthusiasts and professionals to share their knowledge and love of outer space with the public. International Astronomy Day is a great opportunity for people of all ages to learn about the planets, the moon, and the stars, and how they have been used for navigation. It is also a day to raise awareness about the impact of space travel on the human body, such as the effects of low gravity and microgravity on muscle health.
| Characteristics | Values |
|---|---|
| Date | May 3rd, 2025 |
| Frequency | Twice a year |
| Started by | Doug Berger, then president of the Astronomical Association of Northern California |
| Started in | 1973 |
| Purpose | A way for astronomy enthusiasts and professionals to share their knowledge and love of outer space with the general public |
| Activities | Visiting a planetarium, learning about the phases of the moon, researching ancient sailors and how they navigated using the stars, learning about the planets and their names, etc. |
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What You'll Learn
Muscle atrophy in space
Astronauts have been able to track their muscle health in space for the first time using a handheld device, revealing which muscles are most at risk of weakening in low-gravity conditions. This is important as NASA plans missions to the Moon and Mars, where astronauts may need to perform strenuous activity in partial gravity after long periods in near weightlessness.
Space travel induces skeletal muscle atrophy, causing rapid and pronounced muscle wasting in humans that reduces their long-term flight capabilities. In microgravity, muscles no longer need to work as hard, and this inactivity causes muscle loss or atrophy. This can be as much as a 20% decrease in average skeletal muscle mass over one month and a 30% decrease in average skeletal muscle strength over the same period. This loss of muscle mass and function can hinder astronauts from performing mission tasks and increases their risk of injury upon return to higher-gravity conditions.
The impact of space travel on muscle atrophy has been studied using rodent models, with similar effects observed on the skeletal muscle of rats. In addition, researchers have used tissue-cultured avian skeletal muscle cells, flown in perfusion bioreactors aboard the Space Transportation System (STS). These studies have shown that significant muscle fiber atrophy occurs due to a decrease in protein synthesis rates.
To counteract bone and muscle loss in microgravity, astronauts engage in muscle-building exercises using equipment such as the Advanced Resistive Exercise Device (ARED). Each astronaut aboard the space station exercises for an average of two hours per day, performing exercises such as stationary biking and running on treadmills. Researchers are also investigating the optimal combination of diet, exercise, and medication to keep astronauts healthy during and after their missions.
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Muscle health tracking devices
Astronauts face significant risks to their muscle health during spaceflight due to inactivity and exposure to low-gravity or "microgravity" environments. To address these challenges, muscle health tracking devices have become essential tools for astronauts to monitor and maintain their muscle health in space. These devices provide insights into the specific muscles vulnerable to weakening in low-gravity conditions, enabling astronauts to take proactive measures to mitigate potential issues.
One notable example of a muscle health tracking device used in spaceflight is the handheld device mentioned in a 2024 ScienceDaily article. This device allows astronauts to track their muscle health, identifying which muscles are most susceptible to degradation in low-gravity conditions. This real-time data empowers astronauts to adjust their exercise routines and interventions to preserve muscle strength and function.
On Earth, fitness enthusiasts and athletes also have a wide range of muscle health tracking devices at their disposal. These devices vary in form, including wristbands, smartwatches, rings, and clip-ons, each with unique features and capabilities. For instance, the Oura Ring Gen 3 offers comprehensive sleep and stress tracking, while the Samsung Galaxy Fit3 accurately monitors heart rate and tracks various workout types, making it an excellent entry-level option for Android users.
More advanced devices, such as the Apple Watch Ultra 2, cater to serious athletes with their extensive data and tracking capabilities. The Charge 6 is another versatile option, counting steps and distance, tracking sleep, recognising various workouts, and monitoring critical health indicators like heart rate, stress, and moods. For cyclists, specific devices from brands like Garmin and Polar pair with bike equipment, providing insights into power and cadence, enhancing performance and training regimens.
In conclusion, muscle health tracking devices have become indispensable tools for both astronauts and individuals on Earth seeking to maintain and improve their muscle health. These devices empower users by providing data-driven insights, enabling them to make informed decisions about their exercise routines, sleep habits, and overall well-being. With advancements in technology, these tracking devices will continue to play a pivotal role in promoting muscle health and overall fitness for diverse user needs.
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Microgravity and muscle impairment
Microgravity, a condition of gravitational fields much smaller than that of Earth, has been found to have a negative impact on the human body, particularly the musculoskeletal system. This phenomenon, experienced during spaceflight, causes bone and skeletal muscle loss, also known as atrophy, with serious implications for astronaut health.
In microgravity, the tissues that make up bones reshape themselves. Bone cells that build new bone slow down, while those that break down old or damaged bone tissue continue at their normal pace, resulting in weaker and more brittle bones. This bone loss, known as osteoporosis, is caused by an excessive release of calcium by bone tissue, which suppresses parathyroid hormone (PTH) and circulating 1,25-dihydroxyvitamin D (1,25(OH)2D). This leads to reduced intestinal calcium absorption, contributing to muscle wasting.
Similarly, muscles that are usually activated by movement on Earth weaken in microgravity as they no longer need to work as hard. This muscle atrophy results in a decrease in the size of individual muscle fibres, leading to reduced force-generating capacity. The inactivity of astronauts during spaceflight further exacerbates this muscle impairment, with the skeletal muscles being more affected by inactivity than by the low oxygen ("hypoxic") environments of spaceflight.
To counteract these detrimental effects of microgravity, researchers are investigating the optimal combination of diet, exercise, and medication to maintain astronaut health. Exercise regimens, such as the use of treadmills and weightlifting simulations in microgravity, have been explored to engage the musculoskeletal system and limit muscle atrophy. Additionally, bed rest studies have shown that amino acid supplementation and rehabilitative aerobic and resistive exercises can help prevent skeletal muscle loss. By understanding how the body experiences exercise in microgravity, researchers aim to develop targeted exercise programs to prepare astronauts before missions, mitigate the effects of microgravity during missions, and enhance post-flight recovery.
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Ancient navigation using the stars
Ancient civilisations like the Egyptians, Mesopotamians, Greeks, and Vikings relied heavily on the stars for navigation. Celestial navigation, or astronavigation, is the practice of using stars and other celestial bodies to determine one's physical position without relying on estimated calculations. This method of navigation uses angular measurements, or "sights", between celestial bodies and the horizon to determine position. Mariners and aviators have used this method to determine their position relative to landmarks or destination points.
Ancient navigators would observe the movements of specific stars and constellations to estimate their latitude and navigate along coastlines and rivers. The Egyptians, for example, developed a "star clock" system that allowed them to measure time at night by observing the positions of stars. This knowledge was not only useful for navigation but also played a role in their religious beliefs and rituals. The Babylonians in Mesopotamia were also pioneers in celestial navigation, creating detailed star catalogues for future navigators.
The Minoans of Crete, an early Western civilisation, also used celestial navigation. Their architecture featured designs that aligned with the rising sun on the equinoxes and the rising and setting of particular stars. Other ancient civilisations such as the Austronesians, Arab Empire, and Norse also excelled as seafarers and likely utilised celestial navigation techniques.
While modern technology has reduced the need for celestial navigation, it remains a vital skill for mariners and aviators to ensure readiness for unforeseen circumstances. The importance of star navigation cannot be overlooked, as it has guided explorers throughout history and continues to play a role in modern aviation and maritime activities.
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Astronomy Day activities
Astronomy Day is a day for astronomers to share their knowledge of outer space with the public. Here are some activities to help spark an interest in astronomy and science:
Planet Song and Guessing Game
This activity involves singing a song about the planets in our solar system. Once the song has been learned, a planet guessing game can be played. This is a fun way to teach children about the different planets.
Phases of the Moon
Teach children about the different phases of the moon with a packet of Oreos, a knife, and a print-out of the various phases. This is a fun, tactile way to learn about astronomy.
Planet Orbits
Using a round pie dish, orange play dough, and a blue ball to represent the Earth, children can learn about how planets orbit the Sun. This activity helps children visualise the solar system in a fun, interactive way.
Constellation Geoboards
Print out a picture of the constellations from Google Images, then make different constellations by stretching elastic bands over geoboards. This activity is a creative way to learn about the night sky and the different constellations.
Moon Craters
Mix four cups of flour with half a cup of oil and press the mixture into the bottom of a cake tin. Ask children to drop small stones into the mixture from a height, creating craters. This activity helps children understand why the Moon has so many craters.
Shadow Play
Shadows are a great way to teach younger children about the Sun's relative motion in the sky. This activity involves learning about how three-dimensional objects can be viewed in two dimensions through shadows.
Model of the Night Sky
Students can create a small model of the Earth and Sun's positions in relation to the constellations of the ecliptic. This activity can be scaled up to a classroom-size model, allowing students to explore the motions of the inner planets.
Hot Air
Students can explore the interaction between air and light through this activity. By observing the "ripples" that rise from the ground on hot days, twinkling stars, and the shape of the Sun at sunrise and sunset, students can learn about the complicated phenomena of light refraction.
These activities provide an engaging way to learn about astronomy and spark an interest in the universe around us.
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Frequently asked questions
International Astronomy Day is a celebration of outer space that occurs twice a year, once in spring and once in fall. It was started in 1973 by Doug Berger, then president of the Astronomical Association of Northern California.
Astronomy enthusiasts and professionals share their knowledge and passion for outer space with the general public. People often visit planetariums, museums, or use telescopes to gaze at the heavens.
People can research ancient sailors and learn how to navigate using the stars. They can also learn about the phases of the moon and the constellations.
Astronauts experience "microgravity" during spaceflights, which negatively impacts their muscles. Therefore, muscle health is an important area of study in the field of Astronomy.
Astronauts have been able to track their muscle health in spaceflight using a handheld device, which reveals which muscles are most at risk of weakening in low-gravity conditions.
