When most beginners start out in planetary astronomy, it's easy to default to the holy trinity' of Jupiter, Saturn and our neighbour Mars. Each boasts unique and relatively easy to observe features, from Saturn's rings and Jupiter's bands and Great Red Spot, to Mars's dusty surface. But why stop there? There are eight planets in our Solar System and many can be appreciated with beginner setups. The 'inner planets', Mercury and Venus, present new and exciting challenges to planetary astronomers. We explored Venus in last month's issue and now it's Mercury's turn for the spotlight.
Due to its proximity to the Sun, extra care must be taken to observe Mercury safely, which adds to the challenge. There are particular times that are best to view this elusive, mysterious planet, and this April we can seize the opportunity. Get ready to enjoy one of the Solar System's unsung heroes.
Following Mercury's path
The fastest planet in the Solar System, Mercury is named after the messenger of the Greek gods, renowned for speed. And time is certainly of the essence with this planet. To catch Mercury, we need to understand how its position relative to the Sun affects its visibility.
Mercury is 0.4 astronomical units (AU) away from the Sun and orbits at speeds of up to 47km per second, compared to Earth's relaxed pace of 30km per second. When it reaches its closest point to the Sun, Mercury is at its fastest and it then slows down slightly the further away it gets. As the innermost planet, it also has the shortest year, taking 88 Earth days to circle the Sun.
هذه القصة مأخوذة من طبعة April 2023 من BBC Sky at Night Magazine.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك ? تسجيل الدخول
هذه القصة مأخوذة من طبعة April 2023 من BBC Sky at Night Magazine.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك? تسجيل الدخول
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The Big Bang produced a Universe filled almost exclusively with hydrogen and helium; all other elements - what astronomers call metals - were produced by stars, supernovae and everything that happens later. So if you can pick out a pristine star with no metals polluting it from among the billions in the Milky Way, then you are likely to have a star dating from our Galaxy's earliest days.
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