Disclaimers:
1. The views expressed in this blog are the author's own and do not necessarily reflect the official policy or position of the organization he works for.
2. This site uses cookies from Google and other third-party service providers to deliver its services, to personalize ads and to analyze traffic. Information about your use of this site is shared with Google and other third-party service providers. By using this site, you agree to its use of cookies.
Showing posts with label Universe. Show all posts
Showing posts with label Universe. Show all posts

Saturday, July 25, 2009

Missions to the moon - then and now


The moon has fascinated us since ages. From being regarded as some sort of a God to being a mere natural satellite revolving around the earth, mankind has come a long way in his perceptions concerning the moon. There have already been multiple expeditions to the moon. And here is something that I found out while going through Yahoo news this morning. It is about the first successful expedition - the Apollo 11 mission. Suddenly out of the blue, a lot of secrets are being revealed. It is debatable as to how much is really true and how much is not. Nevertheless, all of these make for an interesting read. Here is the excerpt:

So, 40 years after the Apollo 11 moon landing, here are some of the facts that you probably didn't know about the historic event:

1. Aldrin took secret communion: Before leaving the Apollo 11 moon-landing module, US astronaut Edwin "Buzz" Aldrin took a Christian Communion, including a wafer and a thimbleful of wine from a kit prepared by his pastor.
Neil Armstrong "watched respectfully, but made no comment to me at the time," Aldrin recalled.

Atheism advocate Madelyn Murray O'Hair, who objected to government employees praying publicly, was suing NASA at the time, so Aldrin kept the act private.

2. Mementos left on Moon: Along with their backpacks, an American flag, and half the Apollo 11 moon-landing module, Armstrong and Aldrin left some sentimental mementos on the surface of the moon, including, a patch from the never-launched Apollo 1 mission, which ended prematurely when flames engulfed the command module during a 1967 training exercise, killing three US astronauts.

The mementos also included medals commemorating pioneering Soviet cosmonauts Vladimir Komarov and Yuri Gagarin, who had died in flight in 1967 and 1968, respectively; goodwill messages from 73 world leaders; and a small gold pin shaped like an olive branch, a symbol of peace.

3. US President had speech ready in case of disaster: President Richard Nixon's speechwriter William Safire wrote a speech in case the Apollo 11 moonwalkers missed the rendezvous with the orbiting command module to return to Earth.

Among the sentiments: "These brave men, Neil Armstrong and Edwin Aldrin, know that there is no hope for their recovery. But, they also know that there is hope for mankind in their sacrifice."

4. Between homecoming and oblivion may have stood a pen: While on the moon, one of the astronauts knocked loose the circuit breaker responsible for igniting the engine that would propel the Apollo 11 astronauts back to the orbiting command module-their only ride home. The interesting fact bout the incident is that Aldrin used a felt tip pen to push the breaker back into place.

5. American flag bit the dust: As the Apollo 11 astronauts blasted off from the moon, flying dust and debris toppled the first American flag planted on the moon. (ANI)

With respect to expeditions to the Moon, not too long back, India's very own formidable mission Chandrayan-1 suffered a terrific setback when one of its key sensors stopped functioning. Although, the ISRO scientists claimed that this would not abort the mission as of now, it could potentially do so in the future. But, it has been claimed that 90 percent of the mission objectives have already been achieved over a period of the last 8 months.

Here is a slideshow, courtesy Sanjana, featuring this very interesting but lifeless natural satellite which you will probably like. If the slideshow does not run automatically, click on the thumbnails on the right hand for a view of some of the most historic pictures concerning the Moon.







Image source: http://static.howstuffworks.com

Wednesday, July 4, 2007

Supernovas

Supernova, one of the most beautiful visualizations that one can behold in the universe.
A supernova is essentially the explosion of a star in outer space. During a supernova occurrence, a star’s luminosity is increased by as much 20 times as the bulk of the star’s mass is blown away at an extremely high velocity. Supernova remnants, including the signature bright light they leave behind, can often be seen in the night sky by the naked eye for several weeks as it gradually diminishes.
There are several different kinds of supernovae, which are believed to be caused by two distinct sources. One possible cause for Supernova occurrences results from a star halting its generation of fusion energy from fusing the nuclei of atoms in its core, causing it to collapse under the force of its own gravity. Another possible source occurs when a white dwarf star accumulates material from another nearby star until it nears its Chandrasekhar limit and undergoes runaway nuclear fusion in its interior, ultimately leading to its destruction.
Supernovas are generally classified according to the lines of different chemical elements that appear in their spectra, the first of which is hydrogen. If a supernova's spectrum contains a hydrogen line, it is classified as Type II, if this line of hydrogen is not present the Supernova is Type I. Within the Type I and Type II classifications are five sub-classifications that include Type Ia, Type Ib, Type Ic, Type II-P and Type II-L, each having its own distinct chemical and physical characteristics.