Friday, April 10, 2015

University of Michigan to help build next-generation dark energy probe

Update to blog post of Thursday, September 5, 2013 ( )

University of Michigan to help build next-generation dark energy probe
By Aimee Balfe (Department of Astronomy) and Carol Rabuck (Department of Physics)

University of Michigan scientists and students will build components of a giant camera that will map 30 million galaxies' worth of the universe in three dimensions.

The camera is officially known as the Dark Energy Spectroscopic Instrument (DESI) and it's designed to help answer one of the most puzzling scientific questions of our time: Why is the expansion of the universe accelerating?
To read the rest of the article, go to:

Wednesday, March 4, 2015

Help name an exoplanet

Last year, the International Astronomical Union (IAU for short) decided that exoplanets deserve names. The IAU is the organization responsible for assigning names to astronomical objects and for demoting Pluto from a planet to a dwarf-planet.

Exoplanets are planets in orbit around stars other than our own sun. Over the past decade, hundreds of exoplanets have been discovered. The hope: exoplanets similar to the earth will eventually be discovered, planets that might be capable of supporting life. In fact we've discovered a wide variety of exoplanets, but we haven't found life beyond our solar system.

Individuals like you can be part of the process of naming one of these exoplanets. For now everyone must go through an official IAU astronomical organization. At the time of this post, there are two such organizations in the Ann Arbor area, the Ann Arbor Hands Museum and the University Lowbrow Astronomers. If you want to participate now you should look at the rules for this process (see the following web site)...

If you want to work through the Lowbrows, please leave a suggested name along with a short reason why you think it is an good name for a planet as a comment on this post. We will go through the comments, we are allowed to submit one name, so we will pick what we consider to be the best name and submit it.

You can also go to to find other organizations to work with.

Over the next few months suggested names will be send to the IAU by the Lowbrows and other organizations. Sometime this summer, all interested parties will be allowed to vote on the different names that the IAU has received.

Wednesday, January 28, 2015

Barns Are Painted Red Because of the Physics of Dying Stars

I like articles such as this one that take mundane phenomena and link them to the stars. Though worth a read, punchline / TL;DR of this is that nuclear fusion stops generating excess energy at iron and this leads to an abundance of iron seeding the universe following supernovae, finding its way to rocky planets such as ours. Thus, iron oxide is plentiful, cheap, and just happens to make red paint.

Monday, January 19, 2015

Rare Triple Shadow Transit on January 23/January 24.

During the evening of Friday January 23/Saturday January 24 there will be a triple shadow transit. This is a rare occurrence where three of Jupiter's moons (Europa, Callisto and Io) pass between Jupiter and the Earth. For a period of time the shadow of the three moons will be visible on Jupiter's disk.

This is easy to observe with a small telescope, provided it is clear and dark at your location while the transit is taking place. For observers in the eastern United States (in the Eastern time zone) here is the timing....

Friday January 23 22:09 Callisto's shadow appears
Friday January 23 23:36 Io's shadow appears
Saturday January 24 00:03 Io begins transit
Saturday January 24 01:27 Europa's shadow appears
Saturday January 24 01:31 Callisto begins transit
Saturday January 24 01:54 Io's shadow disappears
Saturday January 24 02:07 Io ends transit
Saturday January 24 02:17 Europa begins transit
Saturday January 24 02:59 Callisto's shadow disappears
Saturday January 24 04:23 Europa's shadow disappears
Saturday January 24 04:54 Europa ends transit

(These timings are approximate, it is best to start observe a few minutes before the times indicated to be safe). Observers at other locations can adjust the time zone to determine the timings. If the sun is above the horizon at the specified time, you wont be able to see the transit.

See this article from Astronomy Now: "Jupiter’s moon dance and shadow play to delight observers:"

Thursday, January 1, 2015

Rosetta Update and Nature's 10 People who mattered this year.

Update to earlier blog post ...

The magazine Nature published "365 days: Nature's 10, Ten People who mattered this year." The first of these 10 people was Andrea Accomazzo "A former test pilot steered the Rosetta mission to an icy world in deep space."

The Rosetta mission was the first successful attempt to place a lander on a comet. Some media reports described the mission as a failure. Any media reports of a "failure" completely miss the point.

After bouncing a few times, the lander was firmly on Comet Churyumov–Gerasimenko's surface, but in a position where its solar panels will not get any light. So the lander cannot operate as expected. Nevertheless the entire mission has been mostly successful, already resulting in new insights about comets.

The Rosetta spacecraft itself has operated fine, and the lander was able to collect data for a few hours on batteries before it shut itself off due to insufficient power. Mishaps like this happen, and don't necessarily turn a mission into a "failure." Besides there is still a real possibility that the lander will be able to get power over the next few months as the angle of the sun changes.

Among other things the mission returned some beautiful photos. This picture is of the high cliffs on
Comet Churyumov–Gerasimenko taken by the Rosetta spacecraft

Wednesday, December 24, 2014

Curiosity Detects Methane Spike on Mars

Last week the following was posted by NASA....
Dec. 16, 2014: NASA's Mars Curiosity rover has measured a tenfold spike in methane, an organic chemical, in the atmosphere around it and detected other organic molecules in a rock-powder sample collected by the robotic laboratory’s drill.
"This temporary increase in methane -- sharply up and then back down -- tells us there must be some relatively localized source," said Sushil Atreya of the University of Michigan, Ann Arbor, and Curiosity rover science team. "There are many possible sources, biological or non-biological, such as interaction of water and rock."
Traces of Methane have been seen on Mars in the past. While it is possible that this Methane and the other organic molecules are indications of the presence of bacteria on or near the surface of Mars, there are non-biological explanations as well. Scientists are continually analyzing data in an attempt to determine the source of this Methane. For the full NASA post go to....

Also see this post from the University of Michigan....

Saturday, December 6, 2014

Analysis of Higg's Boson Decay Now Shows no Suggestion of Additional Particles (Still no particles that explain dark matter).

Update on the blog post of Friday, January 11, 2013

Shortly after the discovery of the Higgs Boson two years ago, physicists suspected that a new particle lurked in the data (new particles such as this could lead to an explanation for dark matter).

The Higgs Boson is unstable and rapidly decays into other particles. It does so through several different "channels", one  is the gamma gamma channel where the Higgs Boson decays into two gamma particles. This decay cannot occur in one step, it must occur through intermediate particles. The percentage of decays that goes through each decay is called the yield. The yield in turn is based on the available particles. If there are unknown particles available, this will affect the yield.

There was an anomoly in the yield of the gamma gamma channel (the yield was higher than expected) which suggested the existance of a previously undiscovered particle or particles. Such particles might be the components of dark matter.

However based on more careful analysis, this anomoly has disappeared and now there is no suggestion of additional particles.

That doesn't rule out future experiments finding new particles. The LHC (Large Hadron Collider) where the Higgs Boson was discovered is currently undergoing renovations. It will restart at higher energy in 2015. When it restarts, it will be looking for new particles as well as exploring the properties of existing particles, especially the Higgs Boson.

For more information see: (to read the entire article requires a subscription to Science News).