Stories tagged planets

Jan
08
2013

More Earths on the horizon?: Who knows how many potential new Earths are out there circling other stars in the Milky Way?
More Earths on the horizon?: Who knows how many potential new Earths are out there circling other stars in the Milky Way?Courtesy NASA
We like to think of our home planet – Earth – as a pretty unique place. It's the only planet in our solar system capable of sustaining life. We look through telescopes and to see exotic looking planets of various sizes and shapes. But we're the one and only Earth, right?

A new census of planets in the Milky Way galaxy shakes up that thinking. New data collected by NASA's Kepler spacecraft pegs one in six stars in the Milky Way of having planets that are the same size as Earth. That one-sixth fraction translates into an estimate of about 17 billion planets that are the same approximate size as our home.

So we're not as exclusive as might like to think. But the exclusivity meters edges back toward us when you factor in the Goldilocks zone – a distance from the host star that's not too hot nor too cold to sustain life. So far, extended research on the new-found planets has identified only four Earth-sized planets that could possibly reside in a Goldilocks zone. The Kepler project has identified a total of 2,740 potential new planets with more research ongoing.

Astronomers have found a new planet, and it's the closet planet to our solar system. But don't get your hopes on going to visit there. It would take 40,000 years to get there and once you arrive, you'll find the planet is mostly lava. And it's much closer to its star than Mercury is to our sun. Its quick orbits on that short track take just 3.2 Earth days to make a year.

Spash!: Martian ocean, Martian ocean. An artist's rendering. Martian ocean.
Spash!: Martian ocean, Martian ocean. An artist's rendering. Martian ocean.Courtesy lttiz
Joining my list of most-pleasing words (ala Donny Darko's "cellar door"), which includes such old favorites as "jasper geode" and "top banana," is the phrase "Martian ocean." And, as it happens, a Martian ocean may have once been a real thing.

Based on the analysis of dozens of the red planet's geographical features, a team of scientists from the University of Colorado at Boulder believe that an ocean may have covered about one-third of Mars' surface, about 3.5 billion years ago. Most of the river delta-like features on Mars, they claim, likely marked the boundaries of the ancient ocean. And although the ocean would have been only about one-tenth the volume of Earth's oceans, the amount of sediment in the deltas suggests that there was once a significant amount of precipitation on Mars, carrying silt through the many river valleys to the ocean.

If the theory is true, Mars would have had a water cycle very similar to Earth's, with "precipitation, runoff, cloud formation, and ice and groundwater accumulation."

And, most importantly, a Martian ocean. Martian ocean. Maaartiiaaan ooocceeaaan. Martian ocean.

May
26
2010

I enjoy working with our team to develop on-line interactive education activities. We are in the final testing of whose goal is to teach about the balance of global water, land coverage, atmosphere and cloudiness required to create a "liveable planet". If you want to play with it and give us feedback - here is the link:

http://profhorn.meteor.wisc.edu/wxwise/climate/makeplanet.html
The goal is to make a habitable planet by adding enough water, atmosphere and clouds to reach a global average temperature of about 15°C (59°F). You can mix and match, add or remove.

* Drag (and drop) an item from the right side to the left to add that element
* Drag (and drop) from the left are back to the right to remove that element
* HINT You must put at least 3 clouds by the planet!!

There is a timer to see how fast you can make the planet livable.

Popular Mechanics summarizes how our knowledge of planets in the Solar System has changed over the last 30 years of space exploration.

So we've been stuck in the deep freeze in Minnesota for a while. I'm ready to go to HD80606b. You haven't heard of it? It's a newly discovered planet that has hot weather. Extremely hot weather that can climb by 1,200 degrees in just hours. Read more about it here. Now where did I put my sunscreen?

If you were sad to see Pluto stripped of its planetary status, you can be glad that the poor mass of rock and ice has been given a break. The international body that officially defines the names of stellar objects has decided to call all objects like Pluto, plutoids. So if Pluto isn't a planet, what is it? It's a plutoid...so is Eris.

Apr
13
2008

NASA Science website is an awesome resource

NASA Science website
NASA Science websiteCourtesy NASA
To show how useful this site can be, here are links to pages I found as I dug deeper into just one of the many areas on the NASA Science website.

Science for different levels of learning

The NASA Science website provides learning opportunities for four learning groups.

Earth, sun, planets, and astrophysics

The NASA Science website is divided into these parts.

Here is the illustrated answer to that tricky question. Follow these links to a story and image of the formation of a new planet in a nearby galaxy.