Sunday, February 24, 2013

Carnival of Space #290

Welcome to Carnival of space # 290. The carnival is a collection from high quality blogs and websites dealing with space and astronomy. Just to open this Carnival I will mention that the publish day of this Carnival is the Jewish holiday of Purim, as you can read all about in the book of Esther. In the book of Esther there are some remarks for astronomers and astrologist (Which was more or less the same 2000 years ago in Persia). For example look at chapter 1 verse 13 (I am using a Jewish translation so there will probably be some differences from your version): "Then the king said to the wise men, who knew the times--for so was the king's manner toward all that knew law and judgment". It is clear that the wise men who knew the times were the astronomers tracking the motion of the planets... If you happen to know Hebrew or want to check if Google translate will manage to translate it to your mother tongue, try reading the Hebrew version of "Astronomy and Purim".




And here are the articles for this carnival:

The Once and Future Moon, part of Air&Space magazine writes about Geological sampling and planetary exploration.

Next big Future writes about Dennis Tito which is planning a space mission that would involve a flyby of Mars with a free return back to Earth, without stopping. That type of low-energy trajectory requires a special set of orbital circumstances: The presentation says those circumstances exist for the 2018 opportunity but won't repeat until 2031. Two astronauts living in spartan conditions could make the 501-day trip in a modified SpaceX Dragon capsule, launched by SpaceX's yet-to-be-flown Falcon Heavy rocket.

Another item from Next big future is about Carver Mead that said that we're all taught that there was a revolution in scientific thought that started with relativity and quantum mechanics. "Actually, that's not the case," he said. "A revolution is when something goes clear around. And what happened starting in the first 25 years of the 20th century was that there was the beginning of a revolution, and it got stuck about a quarter of the way around."

From Computer pioneer Carver Mead's point of view, the key to a more intuitive explanation of the universe lies in not only the interrelationships of matter and
forces, but also a better understanding of the electron. "We need to treat the wave functions of our electrons as real wave functions," he said. "I have found personally that I had to go all the way back and reformulate the laws of electromagnetism, starting with the quantum nature of the electron as the foundation."

A more holistic approach was suggested by none other than the Austrian physicist and philosopher Ernst Mach. As Mead tells it, Mach "took Newton to task. He said, 'Look, your idea of absolute motion is a stupid idea. Motion can only have meaning when what it is that's moving is moving relative to other matter in the universe'."

And the last item from Next Big future is about the question are we alone? Although hundreds of planets orbiting other stars have been discovered in the past 15 years, we cannot yet answer the age-old question of whether any of these planets are capable of sustaining life. However, new NASA technology may change that, by giving us our first look at distant planets that not only are the right size and traveling in the temperate habitable zone of their host star, but also show signs of potential life, such as atmospheric oxygen and liquid water.

3D printing is a genuinely incredible new technology. After taking off in the 21st century on Earth, it looks set to become one of the defining technologies in human space travel and colonization. Could 3D printed food provide astronauts with the meals of the future? Find out in this fine article by Markus Hammonds from Discovery new.

The Meridian Journal also writes about the possibility of finding life on exoplanets. Colourful exoplanets may be first to show evidence of alien life.

Everyday Spacer writes to increase awareness about a science fair which is in jeopardy.

And if you need some reading recommendations, Catholicsensibility send us his impressions of the book "The Brightest Stars".

Did you manage to See 2012 DA14? I didn't although other people in my area did. Astro Swanny's AAArtscope blog summarize the close approach of the asteroid. And Astroblog Ian Musgrav sends us his superb pictures of the flyby!

Our last item for this week from L. Riofrio gives tribute to his colleague David S. McKay who trained Apollo astronauts in geology and found signs of life in a Martian meteorite, passed away this week.

That's all for the week, May your days be long and your nights clear!






Friday, January 4, 2013

The rising moon

Many of us enjoy the sight of a sunset or sunrise, but only a few ever observe the actual rise or set of the moon. There are several reasons for this. First, while most people can estimate the time of the sunset or sunrise, the time for the moonrise and moonset are not very well known and also they change dramatically every day. In addition, sunsets can be seen everyday, but seeing the moon rise or set is best when it is full or almost full, which is only 3-4 days in a month.
Rising moon
Rising moon

In order to observe the moon rise, you will need to find out two parameters: when and where. I usually use the heavens-above site (as mentioned in the article about seeing satellites), which provides this data under the moon section. These parameters change according to the observer's location. Check out the times and the azimuth (angle) of the rising and try to get to a spot where the horizon is visible and the rising moon can be seen from its first minute. Try for a full or almost full moon and check the difference of the moon appearance in the blue or dark sky. In the photo above, the moon is very dark although it is almost a full moon. This can be seen only during the first minutes of the moon rise. Also, make sure to notice the large and orange moon. Of course, everything said about the moon rise is correct for the moon-set, so if you have a clear view to the west and not to the east, watch the moon-set.
The following video shows a very red, and a distorted moon-rise. The moon is not full, about 90% of the moon face are illuminated. The video is from 1 minute after the rise, after another five minutes the moon color changed to orange and about an hour later the moon was high enough to become white.


Wednesday, November 28, 2012

Moon Perigee and Apogee

Patience pays off. Six months ago I took a picture of the moon at Perigee, the closest point in its orbit to Earth. It was a full moon. Today (28-Nov-2012) it is a full moon again, but the moon is furthest away from Earth in its orbit - Apogee. The moon is indeed smaller, and in the exact ratio of the distances - about 15%. It is an experiment that I have wanted to do for a very long time and I am happy that I've completed it successfully.
The Apogee moon photo is from the moonrise which gives the orange tint to the picture. The reason for the orange moon is detailed in the following article.

Here is a photo of the two moons. It is not a matter of resizing. The same camera, same setting, same zoom were done to both photos. A picture is worth a thousand words.
Moon comparison at Perigee and Apogee
Moon comparison at Perigee and Apogee

Monday, November 26, 2012

Carnival of space #277

Hi and welcome again to the Venus Transit for another carnival of space. The Transit is history at least for the next hundreds years, but there is plenty of other stuff going around so take a small break and dive into this issue.
Carnival of Space
Carnival of Space


Ray Sanders from "Dear Astronomer" has a new episode of "The Cosmic Ray Show" airing on November 27th at 7:00PM Pacific. Join Ray along with his co-host, astronomer Jerry Hilburn, and special guest, astronomer Dave Reneke as they discuss the recent solar eclipse, and take a virtual tour of the astronomical sights of the southern hemisphere. Featured musical guest is Google+ sensation, Ryan Van Sickle.

Is there a role for airships in the space age? This post from tranquility base introduces two novel ways that airships can contribute to space exploration. 

Centauri Dreams looks at Rod Hyde's ideas on laser fusion, as developed in a starship paper he wrote in the 1970s along with collaborators at Lawrence Livermore National Laboratory.

Two articles from Next Big Future:
In an interview with NPR, John Grotzinger, the principal investigator for the Mars Curiosity rover mission, indicated that the data [that they are getting from Mars Science Laboratory Sample Analysis at Mars Instruments] is gonna be one for the history books. It's looking really good. The announcement will be in a few weeks after more tests and confirmations are run. Curiosity can not directly detect the presence of Mars life. Curiosity can detect organics, which would be the presence of the building blocks of life on the surface of Mars. 

Information acquired by L2 this week revealed plans for a “game-changing” announcement as early as December that a new commercial space company intends to send commercial astronauts to the moon by 2020. According to the information, the effort is led by a group of high profile individuals from the aerospace industry and backed by some big money and foreign investors. The company intends to use “existing or soon to be existing launch vehicles, spacecraft, upper stages, and technologies” to start their commercial manned lunar campaign. New Space Watch identifies the company Golden Spike as the company that will have the commercial manned mission to the moon. It is registered in Colorado to Alan Stern, a former administrator of NASA's Science Mission Directorate, and now working on the New Horizons Pluto mission at the Southwest Research Institute in Boulder, Colorado.

Universe Today also relates to the new findings on Mars. The Mars Science Laboratory team has hinted that they might have some big news to share soon. But like good scientists, they are waiting until they verify their results before saying anything definitive.
Once again people are worrying that astronomical alignments will cause Eathquakes, Astroblogger analyses why the latest batch is nothing to worry about. If alignments and earthquakes aren't enough, now the largest solar flare recorded (the Carrington Event) is being attributed to a planetary alignment. But it just aint so.

Lucky Astroblogger is an Aussie so he had a great chance to view the last solar eclipse. Lucky for us, he shares his photos with us!

Pamela Hoffman from Everyday Spacer sends two articles: Attend an airshow and Watch a partial Lunar eclipse

And as a last treat watch the latest video from Amy Shira Teitel  author of VintageSpace. I already subscribed to her YouTube channel and eager to see new episodes.




That's all for this issue. Hope you all have long days and clear nights.