Wednesday, May 23, 2012

I don't know about you...

...but I'm not from Venus!

Venus has been romantasized throughout history. It has been called our twin sister, the planet of love, and many stories have been made about it. One that comes to mind is C.S. Lewis's space trilogy. In the second book in the trilogy, Pereladra, the main character goes to Venus in a coffin spaceship. Where he lands is covered in water, with stretches of grass or something floating on top. Everything there is provided for and each meal is better than the last. Alas, this is not to be.

Now that we've sent probes to Venus, we know how wrong this is. It's quite the opposite, in fact. It's deadly, dangerous, and barren. The probes sent melted within an hour after landing on the surface. That's how hot it is! And it's all because of those mysterious clouds that surround Venus.
1979 ultraviolet image taken by Pioneer Venus
Hubble Space telescope using solid state imaging

Hubble telescope using ultra violet imaging
You know about greenhouse effect? Well this is exactly what is happening on Venus, only to an extreme. The clouds trap all the radiation from the sun and none of it escapes. This is further aggravated by all the volcanic activity going on.

There's lots of volcanic activity on Venus but no plate tectonics, not like what we see on Earth. The plates don't move around but magma still pushes its way to the surface.

One of the coolest things about Venus is that it rotates the opposite way that Earth does. It also rotates very slow. Before things got more settled in the solar system Venus was hit with a big enough object to force its rotation in the opposite direction. That also makes it so Venus doesn't have a magnetic field. That just adds to all the craziness going on already!

Venus has been called our twin but the only thing similar is their sizes. According to the Universe television series, Venus is our evil twin. Evil or not, it's a fascinating planet, enough to be named after the goddess of love


Notes:
Textbook: Astronomy Today; Chaisson, McMillan
Images:http://www.jpl.nasa.gov/spaceimages/search_grid.php?category=venus











Tuesday, May 8, 2012

There's Something About Mercury

We aren't all as infatuated with Mercury as Mary's lovers were, but it's still a pretty neat planet. This is the first of the planets in our Solar System. It is pretty small, and many find it uninteresting. But for me it will always be my first love, the one that got away. It was my favorite planet in elementary school. I can still picture the postcard I made about it. Yeah, Saturn has pretty rings, and Jupiter has that huge storm going on, but Mercury, Mercury has one side perpetually facing the Sun for three months straight! The extreme in temperatures it causes was so fascinating to me. I decided that anyone who wanted to take a vacation in space to get a sun tan, then Mercury would be the place to go.


I decided to replicate this wonderful postcard:

Like I mentioned before, Mercury has a different kind of orbit. At first, it was theorized that it was comparable to the way the moon orbits Earth. It's different in that one side of Mercury faces the Sun for three months at a time. So it's the perfect length for a summer vaycay!

The surface or Mercury doesn't seem different from the Moon's.
It's what lies beneath that matters.

Mercury, although plain looking, is no ordinary planet. It may look like the moon, but it's quite different. For one, it has a magnetic field. That is a pretty big deal. The moon, Mars, and Venus don't have magnetic fields. This makes Mercury an option for colonization. Having a magnetic field protects the plantet from deadly solar radiation. Of course we'd have to stay away from the areas with extreme temps. And let's not forget about not having one of those atmospheres. 

Although Mercury is the smallest planet, it has a big place in my heart. Hopefully this blog will help people realize that there is indeed Something About Mercury.

Sources:
Image 1: My childhood memories
Textbook: Astronomy Today; Chaisson, McMillan