With its vast oceans and protective atmosphere, our home planet has proved just right for the development of life and is the only world in the universe where life is currently known to exist. In addition, there are dwarf planets, like Pluto, and countless numbers of smaller bodies, including asteroids and comets.įor educational resources and more information for children and teachers, visit our dedicated Stamp Collecting Month website.Įarth is the largest of the “terrestrial”, or rocky, planets (12,742 km in diameter), and has the greatest density of any planet in the solar System. These planets are divided into two groups: the small rocky planets of the inner solar system – Mercury, Venus, Earth and Mars – and the massive gas giants beyond the asteroid belt – Jupiter, Saturn, Uranus and Neptune. Our solar system is made up of eight major planets that orbit the Sun. Here are just a few snippets of information you may or may not have known about the planets of ‘Our Solar System’. Neptune’s stamp also features the dwarf planet Pluto.Īs more and more exciting astronomical discoveries continue to take place, Australia Post hopes to help inspire both adults and children to explore and enhance their knowledge about our solar system with the new stamp collection. These include the four inner-belt terrestrial planets Mercury, Venus, Earth and Mars and the larger outer-belt giants Jupiter, Saturn, Uranus and Neptune. The stamp pack features unearthly illustrations of all eight of the fascinating planets of our solar system. These celestial wonders of our solar system were formed about 4.6 billion years ago. The ‘Our Solar System’ stamps feature the eight spectacular planets that orbit our Sun. Postal Service The stamps highlight several features of the Sun.This year Australia Post celebrates its 2015 Stamp Collecting Month (SCM) with the launch of the ‘Our Solar System’ stamp collection. Postal Service issued a set of stamps highlighting views of the Sun from NASA’s Solar Dynamics Observatory on June 18, 2021. It is also important to observe the same event with different wavelengths in order to get a more complete picture of the physics of the event.įind out more about the different wavelengths of light SDO images the Sun in different wavelengths because they provide different information on different solar features and layers of the Sun. When all the visible colors are summed together, scientists call this “white light.” The sun looks redder when near the horizon since the light must travel through more of Earth’s atmosphere and consequently loses blue wavelengths before getting to the camera’s lens. The sun, in fact, emits light in all colors, but since yellow is the brightest wavelength from the sun, that is the color we see with our naked eye - which the camera represents since one should never look directly at the sun. Taking a photo of the sun with a standard camera show a disk with no features and a yellowish color. The part of the solar atmosphere that can be seen from the ground during a total solar eclipse. SDO has recorded hundreds of millions of images from the Sun, showing us different views of the visible surface all the way out to the extended part of the Sun’s atmosphere called the corona. SDO views the sun in 13 different ways, using two different onboard instruments. Solar Dynamics Observatory (SDO) & the Sun’s Cycle SDO views the Sun in 10 different wavelengths of light covering the visible, ultraviolet, and extreme ultraviolet bands of the light spectrum. These forever stamps highlight amazing views of the Sun from a spacecraft that has been monitoring the Sun 24-hours a day for more than a decade.
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