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Dr. Marc Rayman, Monday, 12-7-15 December 8, 2015

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Dr. Marc Rayman, Monday, 12-7-15

http://archived.thespaceshow.com/shows/2599-BWB-2015-12-07.mp3

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Guest:  Dr. Marc Rayman.  Topics:  The Dawn Mission spacecraft, Ceres news & updates, plus much more.  Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, https://thespaceshow.wordpress.com.  Comments and questions should be relevant to the specific Space Show program. Written Transcripts of Space Show programs are a violation of our copyright and are not permitted without prior written consent, even if for your own use. We do not permit the commercial use of Space Show programs or any part thereof, nor do we permit editing, YouTube clips, or clips placed on other private channels & websites. Space Show programs can be quoted, but the quote must be cited or referenced using the proper citation format. Contact The Space Show for further information. In addition, please remember that your Amazon purchases can help support The Space Show/OGLF. See www.onegiantleapfoundation.org/amazon.htm.  For those listening to archives using live365.com and rating the programs, please email me as to why you assign a specific rating to the show. This will help me bring better programming to the audience.

We welcomed back Dr. Marc Rayman to the show to discuss the Dawn Mission and Ceres updates.  During the first segment of our 1 hour 25 minute discussion, Dr. Rayman said that Dawn was as close to Ceres as it would ever be & that it was in a stable orbit that would last a very long time as they need to avoid having the spacecraft crash into the surface of Ceres.  Dawn is approximately 240 miles above Ceres and its orbital velocity to maintain this orbit is around 600 mph. It takes about 30 minutes for a radio signal to travel one way between Ceres and Earth for a one hour round trip time.  He discussed this Ceres stable orbit in some detail.  We talked about the mission end for Dawn which will likely happen sometime in 2016 as the thruster hydrazine fuel runs out.  He described the failure to us and why they cannot predict with certainty the end date an time.  Marc also talked about the reaction wheels (gyros), the fact they lost two but had one spare to use. He explained how they have been operating the spacecraft with just two gyros instead of the required three.  We talked about some of the new information coming back, exciting findings by Dawn and of course the mysterious bright spots.  Marc commented about the mountain Ahuna Mans which rises to about 20,000 feet above the surface.  Doug called to ask about the water ice and the dark cracks he saw in the photos of the bright spots.  He also inquired about a human mission to Ceres.  Listeners brought up private human missions, including the possibility of a private human mission to Mars.  Don’t miss what Dr. Rayman said about these potential missions.  In response to a question about what would humans do on Ceres, our guest said EXPLORE! BJohn wanted to know if Vesta and Ceres had a special alignment making the mission possible or if we could pretty much visit any two asteroids as we did with these two (dwarf planets).  Doug emailed in asking how the astronauts would actually get around on the surface of Ceres, a question which led to discussing Ceres gravity.

In the second segment, I asked Marc how he and the others associated with these very long term planetary missions develop the patience to wait years and years for the spacecraft to arrive at the destination and start doing what it was designed to do. Marc had some interesting comments and observations about this.  Jerry asked if nuclear propulsion would benefit missions such as Dawn and planetary science in general.  Helen wanted to know what was the most disappointing thing about Dawn.  The reaction wheel failure was a big item but Marc had interesting things to say about defining something related to a mission as a disappointment.  Another listener asked if JPL tracked the general population popularity of its planetary missions.  Later in the segment we discussed robots vs. humans for some missions, then Jane asked about public school text books containing this cutting edge planetary science information.  Both Marc and I offered comments on this subject.  Marc also suggested we visit www.spaceplace.nasa.gov.  Another listener asked for the best school study path to pursue to be able to do what Marc does today at JPL.  Marc had lots of interesting things to say about this so if you want to do planetary science, note what he said. There are multiple study paths to take that can lead you to this kind of work at JPL & other centers/institutions.  He also noted that JPL has lots of non-technical people doing key things in the planetary science department with missions so the path is not always science and engineering.  Paul offered up the last question inquiring about the volume of data to be studied from Dawn.  Marc directed our attention the JPL Planetary Data System Repository which is where this information ends up and anyone can access and research it.  There are years if not decades of research awaiting for the Dawn Mission data.

Please post your comments/questions on TSS blog above. You can reach Dr. Rayman through JPL or me.

 

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John Batchelor Show Hotel Mars, Wednesday, 10-14-15 October 15, 2015

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John Batchelor Show Hotel Mars, Wednesday, 10-14-15

Special Guest:  Dr. Marc Rayman

http://archived.thespaceshow.com/shows/2565-BWB-2015-10-14.mp3

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Guests: John Batchelor, Dr. Marc Rayman, Dr. David Livingston. Topics: Ceres and the latest discoveries and updates. You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We do not permit the commercial use of any Space Show program or part thereof, nor do we permit Space Show programs to be edited, placed on YouTube, or other private channels & websites. Space Show programs can be quoted in news articles, papers, academic & research work but must be cited or referenced in the proper citation format. Contact Dr. Livingston for questions about our copyright and trademark policies which we do enforce. This program is archived on The Space Show website, podcasting, and blog sites with permission from John Batchelor. Please visit the John Batchelor Show website for more information about this fine program, www.johnbatchelorshow.com. Remember, your Amazon Purchases Can Help Support The Space Show/OGLF (www.onegiantleapfoundation.org/amazon.htm). For those of you listening to archives on live365.com & rating the programs, please email me the reasons for your rating. This will definitely help improve Space Show programming. Thank you. Please note that audio and transition issues are a result of copying the John Batchelor broadcast & are not within my control as they originate in the Batchelor studio.

 

John Batchelor and I welcomed back Dr. Marc Rayman for important news and discovery update information on Ceres and the Dawn Mission. Some of the topics we discussed included the latest on impacts and accumulation of debris over millions of years making Ceres into a sort of sponge for impact material. We also discussed the latest theories on the bright spots, including the possibility of salt and what that may mean for Ceres development and science. I asked Marc general science questions and what it would take to have definitive answers to many of the Ceres mysteries. Near the end, John talked about Vesta and how it might compare to Earth in contrast to how Ceres might compare to Earth.

 

Please post your comments/questions on TSS blog above. You can email Mr. Batchelor or Dr. Rayman through me at drspace@thespaceshow.com.

 

 

 

The John Batchelor Show Hotel Mars, Wednesday, 7-29-15 July 30, 2015

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The John Batchelor Show Hotel Mars, Wednesday, 7-29-15

http://archived.thespaceshow.com/shows/2516-BWB-2015-07-29.mp3

Special Guest:  Dr. Marc Rayman

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Guests: John Batchelor, Dr. Marc Rayman, Dr. David Livingston. Topics: Ceres bright spots, topography, Dawn Mission, & more. You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We do not permit the commercial use of any Space Show program or part thereof, nor do we permit Space Show programs to be edited, placed on YouTube, or other private channels & websites. Space Show programs can be quoted in news articles, papers, academic & research work but must be cited or referenced in the proper citation format. Contact Dr. Livingston for questions about our copyright and trademark policies which we do enforce.  This program is archived on The Space Show website, podcasting, and blog sites with permission from John Batchelor. Please visit the John Batchelor Show website for more information about this fine program, www.johnbatchelorshow.com. Remember, your Amazon Purchases Can Help Support The Space Show/OGLF (www.onegiantleapfoundation.org/amazon.htm). For those of you listening to archives on live365.com & rating the programs, please email me the reasons for your rating. This will definitely help improve Space Show programming. Thank you. Please note that audio and transition issues are a result of copying the John Batchelor broadcast & are not within my control as they originate in the Batchelor studio.

 

John Batchelor and I welcomed back Dr. Marc Rayman to the show to discuss the latest news coming back from the Dawn Mission regarding dwarf planet Ceres. We talked about the Ceres topography including the bright spots, the haze in crater Occator, the three mile high pyramid peak which may be remnants of a volcano, plus the dust layer over Ceres, ice, and oceans under the ice. Dr. Ryman talked about some of the processes that might have created these characteristics and conditions on Ceres but as you will hear, much is still unexplained. Dawn will make a close pass of Ceres at 900 miles from the surface in early August. Its closest pass will be in December 2015 at about 232 miles above the surface. Check out the new Dawn color coded topography map at http://dawn.jpl.nasa.gov.

 

You can email Mr. Batchelor or Dr. Rayman through me at drspace@thespaceshow.com.

 

John Batchelor Show Hotel Mars, Wednesday, 5-13-15 May 14, 2015

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John Batchelor Show Hotel Mars, Wednesday, 5-13-15

http://archived.thespaceshow.com/shows/2473-BWB-2015-05-13.mp3

Special Guest: Dr. Marc Rayman

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Guests: John Batchelor, Dr. Marc Rayman, Dr. David Livingston. Topics: The Dwarf Planet Ceres & Dawn Mission. Vostochny airport and more. You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We do not permit the commercial use of any Space Show program or part thereof, nor do we permit Space Show programs to be edited, placed on YouTube, or other private channels & websites. Space Show programs can be quoted in news articles, papers, academic & research work but must be cited or referenced in the proper citation format. Contact Dr. Livingston for questions about our copyright and trademark policies which we do enforce. This program is archived on The Space Show website, podcasting, and blog sites with permission from John Batchelor. Please visit the John Batchelor Show website for more information about this fine program, www.johnbatchelorshow.com. Remember, your Amazon Purchases Can Help Support The Space Show/OGLF (www.onegiantleapfoundation.org/amazon.htm). For those of you listening to archives on live365.com & rating the programs, please email me the reasons for your rating. This will definitely help improve Space Show programming. Thank you. Please note that audio and transition issues are a result of copying the John Batchelor broadcast & are not within my control as they originate in the Batchelor studio.

 

John Batchelor and I welcomed back Dr. Marc Rayman to update us on the latest with the Dawn Mission and Ceres. We talked about the bright spots on Ceres that are still a mystery, dwarf planets, possible similarities with Pluto, what’s ahead for the Dawn Mission and Ceres, plus why it is unlikely that there be ice on the surface of Ceres. We also talked about the end game for Dawn and the fact that dawn was not equipped to detect a magnetic field on Ceres.

 

Please post your comments/questions on The Space Show blog. You can email Mr. Batchelor or Dr. Rayman through me at drspace@thespaceshow.com .

Dr. Marc Rayman, Monday, 1-26-15 January 27, 2015

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Dr. Marc Rayman, Monday, 1-26-15

http://archived.thespaceshow.com/shows/2401-BWB-2015-01-26.mp3

Your Amazon Purchases Helps Support TSS/OGLF (see www.onegiantleapfoundation.org/amazon.htm)

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Guest:  Dr. Marc Rayman.  Topics:  As the Dawn Mission Director, Dr. Rayman talked about Vesta, Ceres, ion propulsion & much more.  Please direct all comments & questions regarding Space Show programs/guest(s) to the Space Show blog, https://thespaceshow.wordpress.com.  Comments & questions should be relevant to the specific Space Show program. Written Transcripts of Space Show programs are a violation of our copyright & are not permitted without prior written consent, even if for your own use. We do not permit the commercial use of Space Show programs or any part thereof, nor do we permit editing, YouTube clips, or clips placed on other private channels & websites. Space Show programs can be quoted, but the quote must be cited or referenced using the proper citation format. Contact The Space Show for further information. In addition, please remember that your Amazon purchases can help support The Space Show/OGLF. See http://www.onegiantleapfoundation.org/amazon.htm.  For those listening to archives using live365.com & rating the programs, please email me as to why you assign a specific rating to the show. This will help me bring better programming to the audience.

 

We welcomed Dr. Marc Rayman to the program to discuss the Dawn Mission to both Vesta & Ceres.  To find out more about Dawn, visit http://dawn.jpl.nasa.gov.  Also check out Dr. Rayman’s blog The Dawn Journal @ http://dawn.jpl.nasa.gov/mission/journal.asp.   Visit the DS1 site & archives by Dr. Rayman @ http://nmp.jpl.nasa.gov/ds1.   During the first segment of our 91 minute program, Dr. Rayman introduced us to the Dawn mission which first went to Vesta & is now closing in on its second destination, Ceres. We talked about the mission being specifically chosen to visit both Vesta & Ceres & that Vesta data is still undergoing analysis.  Dr. Rayman described Vesta’s Rheasilvia Crater 300 miles in diameter formed by an impact about one billion years ago.  We also talked about Vesta meteorites on Earth.  Dwayne called regarding competing theories about Ceres, planets having changed positions at one time, & Dawn mission limitations.  Perry wanted to know what information the team most wanted to get from Ceres. Dr. Rayman said they wanted to know basics such as what it looks like, what it was made of, ice, etc.  Other listeners wanted to know about Ceres compared to Mars access.  Here, Dr. Rayman had much to say as the subject came up again in the second segment.  Doug wanted to know about the large bright spot on Ceres plus other questions.

 

In the second segment, Dr. Rayman told us about his Dawn Journal (blog) per the above URL.  I asked our guest if he thought of Dawn & other science missions as competitive with human spaceflight missions.  Don’t miss his reply as I believe it was very special. BJohn sent several emails asking for Dr. Rayman’s favorite targets, especially for future missions. He also asked about using nuclear power rather than solar.  Our guest described the solar arrays & why solar was chosen for Dawn.  Ion propulsion came up & was a major discussion topic for the balance of our program.  Dr. Rayman described how ion propulsion worked, why it used a slow but steady acceleration, & its advantages over chemical propulsion.  Matt asked about RTG development for future missions .  Doug sent us another question based on the low Ceres gravity & landing on Ceres to pre-position supplies in advance of a crew.  Our guest pointed out it was far more complicated than Doug implied given that the Ceres orbit was tipped more than 10 degrees from the ecliptic.  Make sure you hear this explanation.  Among the many questions Matt asked, he wanted to know about the German component of the Dawn mission.  As we approached the end of our show, Dr. Rayman gave us a preview of what to expect as we get very close to Ceres, gradually getting as low as Earth & ISS.

 

Please post comments/questions on TSS blog above.  The guest, callers, & those sending emails can be reached through me.