Tag Archives: Solar System

Podcast #26: Neville Young

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This is the 26th episode of the Urban Astronomer Podcast, where we get back to our original focus of interviewing people involved in South African astronomy. Whether they’re professional or amateur, South African, or merely visiting to do astronomy under our clear skies through our world-class observatories, we want to talk to them.  In this episode, we chat with Neville Young. Neville Young Neville has been a member of the Pretoria center of the Astronomical Society of South Africa since the … Continue reading →

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Podcast #8: Venus, KELT-11b and Blood Moon Pregnancies

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Welcome to the 8th episode of the Urban Astronomer Podcast!  This week, Cathrine continues her series on The Planets with the hottest world in our Solar System: Venus.  Allen then reports on the discovery, by a telescope at SAAO’s facility in Sutherland, of KELT-11b, an unusually inflated exoplanet.  And finally we look at what is apparently a common question in parts of the world: Is it safe to watch a Lunar Eclipse, while pregnant? This is Cathrine’s second appearance in … Continue reading →

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Mercury

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Mercury is one of The five classical planets and an easy naked eye object.  The planets stood out from the other stars to our ancestors because of the way they all moved in regular patterns against the night sky, but Mercury was unique in its rapid motion and the way it never strayed far from the sun.  If the planets were to be named for gods, then it was only natural that the flighty mercurial one should be their messenger. … Continue reading →

What does Jupiter weigh?

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Jupiter has a mass of about 1.9 x 1027kg – 1900 trillion Trillion kilogrammes.  That’s more than double all the other planets, asteroids, comets and dust of the entire Solar System put together.  Jupiter is BIG, yet still manages to not weigh anything at all.  How?  Because it is in orbit around the Sun, just like an astronaut orbits the Earth, and so experiences zero gravity.  That’s not to say there is no gravity around Jupiter – it has plenty gravity … Continue reading →

The Scale of the Solar System – a 3rd attempt

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Some time ago, we featured a poster created by the Planerary Society’s Emily Lakdawalla which showed all of the Sun’s largest satellites (or at least, everything we know of that’s bigger than 400km across), to scale.  She has since refined the image to correct perspective effects that made Saturn look bigger than Jupiter, and you can see the result to the right.  Gas giants, rocky planets, minor planets, asteroids, moons, they’re all there.  Click the image to see it in … Continue reading →