DNA Testing | Are You Interested?

Have you considered doing a DNA test? We both had our DNA tested in 2014 by 23andMe. The 23andMe results were interesting. We have thorough genealogy records for most of our family lines going back many generations. We knew what to expect from our DNA results.

My last name is derived from a variation of Raudenbusch near Stuttgart Germany. They came to Philadelphia in 1732 according to the ship manifest. The name was changed after a generation to avoid confusion with other Raudenbusch families who lived nearby. The French & German part of the chart below from 23andMe confirms that information.

They married into family lines that were British & Irish, my most recent ancestors in the timeline chart. The results also showed distant generations from Africa making up a very small part of my DNA. My records show distant relatives on my mother’s side from South Carolina who owned slaves in the late 1700s. The genetic link from 23andMe isn’t a surprise.

Show Me More…

Advertisements

Cassini-Huygens | An Amazing Journey

The Cassini-Huygens mission has delivered an enormous amount of new scientific findings about Saturn, its rings, and the surrounding many moons. Design work on the mission started in the 1980s as a joint effort by NASA, the European Space Agency ESA, and the Italian space agency Agenzia Spaziale Italiana ASI. Launch was on 15 October 1997. It reached Saturn orbit 1 July 2004 after flybys of Venus, Earth, and Jupiter to adjust the orbit speed and direction via gravity assist. My previous posts about many of the findings by Cassini and Huygens are listed here.

On 15 September 2017, the Cassini spacecraft ends the mission by plunging into the atmosphere of Saturn. It will not be left in orbit for fear of collision with a Saturnian moon and possible contamination of the moon. Future missions to the Saturn system need to be free of any potential contaminants from Earth.

Some scientists and mission specialists have worked on Cassini for their entire careers. This video highlights a few of them and how they feel about the legacy of the mission. I congratulate them all for a job well done. I will be watching NASA-TV at 6 am CDT September 15 to see the final moments of the plunge into Saturn. I hope you will be watching, too.

Star Corpses | Three Distinct Types

MinutePhysics author Henry Reich on YouTube explains the physics of a phenomenon in a minute if possible. Here he explains what is left behind when stars die. The corpse of the star depends on what mass the star had in the beginning. He took more than a minute, but less than three. I think that is quite good.

My previous post about this topic describes how stars change over time. Fair warning: It will take more than a minute to read. Probably more than three minutes.

Solar Eclipse | Totality

Eclipse day finally arrived. Before dawn broke, we awoke to much lightning and thunder here in eastern Iowa. It seemed a bad omen. I checked the radar and forecast for central Missouri where we planned to drive. No rain there in the morning and still pretty good odds for a visible eclipse.

The phone rang about 7:30 when our daughter called. They were to meet us as we drove south so she and our two grandkids could share the experience with us. She said her daughter woke with a fever and aches and pains. It seemed another bad omen. She gave her some meds and still hoped to go. We would meet them in 2 hours and make the final decision. We met and decided to go anyway. She slept most of the 2.5 hr drive from there to Auxvasse, Missouri. Would the two bad omens spoil the day?

The weather improved as we drove farther south. The Sun came out and blue skies were peeking through the clouds. We reached the park in the tiny town of Auxvasse. It was a party! Maybe 100 people were in the park. Music was playing. Kids were on the playground equipment. We opened our picnic food. It noticeably darkened as it neared 1 pm.

Totality Approached

We watched through our eclipse glasses to keep track of the progress of the Moon across the Sun. A minute before totality I began to record this video. Next to me was Melanie and our 6 yr old grandson. I love his commentary. Notice how dark it got.

Show me more…

Pluto | Virtual Flyovers | New Horizons Future

The New Horizons spacecraft was launched in January 2006. It coasted by Pluto 14 July 2015 giving us our first close views of the dwarf planet and its moons. The largest moon is named Charon. Previous posts highlighting events of the mission are found here.

NASA released two virtual flyovers of Pluto and Charon on 14 July 2017. They were made using data and elevation models from the mission. Digital mapping and rendering were performed by Paul Schenk and John Blackwell of the Lunar and Planetary Institute in Houston. From the press release of the Pluto flyover:

“This dramatic Pluto flyover begins over the highlands to the southwest of the great expanse of nitrogen ice plain informally named Sputnik Planitia. The viewer first passes over the western margin of Sputnik, where it borders the dark, cratered terrain of Cthulhu Macula, with the blocky mountain ranges located within the plains seen on the right. The tour moves north past the rugged and fractured highlands of Voyager Terra and then turns southward over Pioneer Terra — which exhibits deep and wide pits — before concluding over the bladed terrain of Tartarus Dorsa in the far east of the encounter hemisphere.”

Show me more…

Hovercraft | Homemade

Would you like to ride on a nearly friction-free vehicle? You can make one with some plywood, plastic sheeting, duct tape, blower, and basic tools. Most of the students in my high school physics classes were seniors. Because their graduation was about a week prior to the end of the school year, I still had several juniors in each class for several more days. They were asked to do a project of their choosing and demonstrate it on their last day. In 2002, a student built a working hovercraft similar to this one. I got to be a test dummy for her project. It was great fun.

Recently, we vacationed in Yellowstone Park. On our return trip, we visited that former student whose family has remained good friends with us. She was going through some boxes of old photos and discovered three she knew I would enjoy seeing. She was correct.

Basic instructions

  • Plywood sheet 4 ft wide with a hole large enough to accept blower hose. Tape it in tight.
  • Heavy-duty plastic sheet taped securely around the rim and under the plywood.
  • Cut 8-10 one inch diameter holes in the plastic sheet spaced uniformly.
  • Sit in the center, turn on the blower, and glide away.