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Solar System - Our Neighborhood #798938
01/03/13 02:21 PM
01/03/13 02:21 PM
Joined: May 2010
Posts: 7,458
United Kingdom
Mona - Astronomy Offline OP
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Chimpanzee
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Come tour the Solar System. It's our neighborhood, the star system in which we live. The Sun's gravity holds it all together - planets, dwarf planets, moons, asteroids, comets, Kuiper Belt objects. See what lies between the Sun and the farthest edge of the Oort Cloud.

Solar System - Our Neighborhood

Last edited by Mona - Astronomy; 05/30/18 03:53 PM. Reason: update links

Mona Evans
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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #798992
01/03/13 07:16 PM
01/03/13 07:16 PM
Joined: Feb 2003
Posts: 14,392
Verde Valley, AZ
Jilly Offline
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What a fantastic tour! I had not heard of the scattered disk. NOt clear what that is.

Re: Solar System - Our Neighborhood [Re: Jilly] #799101
01/04/13 06:48 PM
01/04/13 06:48 PM
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Posts: 7,458
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Mona - Astronomy Offline OP
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The scattered disk was new to me when I researched the Kuiper Belt some while ago, Jilly. I'm not surprised that you aren't clear what it is, because astronomers aren't either! Some put it as an extension to the Kuiper Belt, but others refer to it as a separate region because the objects in it behave differently. If I'm still around when they get enough evidence to decide, I can rewrite the Kuiper Belt!

But it's harder to study those outer regions than it is to study galaxies millions/billions of light years away. The galaxies give out radiation and telescopes can detect that. The small, icy bodies that get scarcely any sunlight are very tricky.


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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927837
05/15/18 07:33 AM
05/15/18 07:33 AM
Joined: May 2010
Posts: 7,458
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Mona - Astronomy Offline OP
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Everything changes. There haven't been major changes to the view of our Solar System that I've described in this article. However I have made some updates to it. Do take a tour of the Solar System - Our Neighborhood.


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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927855
05/16/18 05:13 PM
05/16/18 05:13 PM
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A relief map of Mercury.

It's a map of Mercury's northern hemisphere showing the topography. The lowest regions are shown in purple, and the highest regions are shown in red. The difference in elevation between the lowest and highest regions shown here is roughly 10 kilometers.

Among the prominent features visible here are the smooth northern volcanic plains and the enigmatic northern rise. The low-lying craters near the north pole host radar-bright materials, thought to be water ice.

The MESSENGER spacecraft was the first ever to orbit the planet Mercury, acquiring over a quarter of a million images plus other data sets. The mission ended when the spacecraft ran out of propellant and crashed onto the surface of the planet in April 2015.


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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927885
05/18/18 09:30 PM
05/18/18 09:30 PM
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Mona - Astronomy Offline OP
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Mercury isn't a place where you'd ever expected to find ice. But in fact, there are places, such as Mercury's north pole, that never receive direct sunlight. In this image, red shows areas that are in shadow, as detected by MESSENGER. Yellow shows the locations of bright polar deposits imaged by Earth-based radar.

Updated from N. L. Chabot et al., Journal of Geophysical Research, 117, doi: 10.1029/2012JE004172 (2012).



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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927902
05/19/18 08:15 PM
05/19/18 08:15 PM
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Mona - Astronomy Offline OP
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I came across The Planet Mercury Song the other day. It's one of a series of "Planet Songs for Children" and it's a delight. Parents, grandparents, teachers, aunts and uncles & others, you might know someone who'd like this. I'm also glad to say that unlike some well-meaning videos for kids, it is accurate.


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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927955
05/23/18 02:45 AM
05/23/18 02:45 AM
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Mona - Astronomy Offline OP
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Seen from Earth, Venus shines so brightly. You can see Venus is at the center of this amazing nightscape. In addition, in the foreground surf is the light of bioluminescent plankton. Much farther away are numerous single bright stars, most closer than 100 light years away. Farthest away, rising diagonally, is the central band of our Milky Way Galaxy. The image was taken on the Iranian coast of Gulf of Oman.

Image Credit & Copyright: Taha Ghouchkanlu


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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927961
05/23/18 04:19 PM
05/23/18 04:19 PM
Joined: May 2010
Posts: 7,458
United Kingdom
Mona - Astronomy Offline OP
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Venus looks beautiful from Earth, but close up this infographic tells a different story. By the way, although gravity is weaker on Venus than on Earth, you wouldn't be jumping higher. Atmospheric pressure is so high on Venus, it would squash you.


Mona Evans
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Re: Solar System - Our Neighborhood [Re: Mona - Astronomy] #927983
05/24/18 06:08 PM
05/24/18 06:08 PM
Joined: May 2010
Posts: 7,458
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Mona - Astronomy Offline OP
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Mona - Astronomy  Offline OP
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Some people think that Venus could be habitable. And perhaps you might daydream about being closer to the Sun when the long winter nights come, and the temperature drops. After all, "Earth's twin" should be a nice place, shouldn't it? Let's talk about that.

Who wants to go to Venus ?


Mona Evans
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