Tag: science

The first observations of a star, just prior to going supernova

1:30 pm

Astronomers have for the first time observed the changes that took place in a binary star system in the years before one star in the system erupted as a supernova.

In the first survey of its kind, the researchers have been scanning 25 nearby galaxies for stars that brighten and dim in unusual ways, in order to catch a few that are about to meet their end. In the three years since the study began, this particular unnamed binary system in the Whirlpool Galaxy was the first among the stars they’ve cataloged to produce a supernova.

The astronomers were trying to find out if there are patterns of brightening or dimming that herald the end of a star’s life. Instead, they saw one star in this binary system dim noticeably before the other one exploded in a supernova during the summer of 2011.

Key quote: “Our underlying goal is to look for any kind of signature behavior that will enable us to identify stars before they explode,”

The supernova in question, 2011dh, was the closest supernova in decades, occurring in June 2011 in the Whirlpool Galaxy (M51). See my previous posts here and here.

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Weather, not climate

10:35 am

From Walter Russell Mead: Weather, not climate.

Those Via Meadia readers old enough to remember Hurricane Katrina can no doubt remember the many moralizing predictions of smug and condescending green climate hacktivists that followed: global warming was going to mean more hurricanes and bigger ones. Our coasts were toast; it was baked in the cake. The rising sea level combined with the inexorably rising number of major hurricanes were going to knock the climate skeptics out of the park.

Well, no. Andrew Revkin has called attention to this post from Roger Pielke’s blog which shows that as of today it has been 2,226 days since the last major hurricane (Category 3 or higher) hit the US mainland. Unless a big hurricane hits this winter, it means we are on track to break a 100 year record for the longest gap between major hurricanes hitting the coast. (The last Big Calm was between 1900 and 1906.) [emphasis mine]

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Canada has joined the United States in raising objections to a planned $100-billion a year climate fund

12:48 am

The gravy train is ending: Canada has joined the United States in raising objections to a planned $100-billion a year climate fund.

I like this quote describing the U.S.’s objections:

Heading into the United Nations climate conference in Durban this week, the United States has made it clear it will not support the current proposals for the climate fund over concerns about how the money would be raised, lack of verification of how it is spent, and an unwillingness of major emerging countries to commit to legally binding emissions reduction. [emphasis mine]

Other than these minor points, everything about the fund is above board and legitimate.

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Nanosail-D has sailed home, burning up in the atmosphere on September 17

9:14 pm

The solar sail Nanosail-D has sailed home, burning up in the atmosphere on September 17.

The flight phase of the mission successfully demonstrated a deorbit capability that could potentially be used to bring down decommissioned satellites and space debris by re-entering and totally burning up in the Earth’s atmosphere. The team continues to analyze the orbital data to determine how future satellites can use this new technology.

The concept being tested appears to use a solar sail as a navigating tool for guiding defunct satellites back into the atmosphere.

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“Perpetuating rubbish”: a detailed analysis of one part of the new climategate emails

9:42 pm

“Perpetuating rubbish”: a detailed analysis of one part of the new climategate emails.

I think the first comment sums up the tragedy of this situation very clearly:

So privately they said the series had a “dubious relationship to temperature”, but publicly they said it was “well calibrated”? I am just about to the point of never trusting any scientists at all.

The willingness of the climate field to whitewash the fraud and corruption revealed by the first set of climategate emails is now haunting this field badly. Why should anyone believe anything any global warming scientist ever says? It is very clear that too many of them put politics above science in their work.

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One scientist’s perspective on the new Climategate emails

8:12 am

One scientist’s perspective on the new Climategate emails.

Long time readers will recall that in 2004 and 2005 (before Katrina), I led an interdisciplinary effort to review the literature on hurricanes and global warming. The effort resulted in a peer-reviewed article in the Bulletin of the American Meteorological Society. That paper, despite being peer-reviewed and standing the test of time (as we now know), was ignored by the relevant part of the IPCC 2007 that dealt with extreme events. Thanks to the newly released emails from UEA [University of East Anglia] (hacked, stolen, donated, or whatever) we can say with certainty why that paper was excluded from the IPCC 2007 report Chapter 3 which discussed hurricanes and climate change. Those various reviews associated with the release of the UEA emails that concluded that no papers were purposely kept out of the IPCC may want to revisit that particular conclusion.

Read the whole thing. It is worth it to get a real sense about how petty and political the IPCC process is. It has little to do with science, and everything to do with forcing a conclusion down everyone’s throat.

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A preview of the new Mars unmanned rover Curiousity, set for launch on Saturday

7:38 am

A preview of the new Mars unmanned rover Curiousity, set for launch on Saturday. This is the part of its mission that scares me the most:

The final stages of the entry, descent and landing sequence will be especially tense as the rover, dubbed Curiosity in a student naming contest, is gently lowered to the surface on cables suspended from a rocket-powered “sky crane” making its debut flight. Too large to use airbags like those that cushioned NASA’s Pathfinder, Spirit and Opportunity rovers, Curiosity will rely instead on landing rockets positioned above the rover, avoiding the challenge of coming up with a reliable way to get a one-ton vehicle off of an elevated, possibly tilted lander. Instead, Curiosity will be set down on its six 20-inch-wide wheels, ready to roll.

If it works.

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An update on the efforts to save Phobos-Grunt

8:52 am

An update on the efforts to save Phobos-Grunt.

“The first pass was successful in that the spacecraft’s radio downlink was commanded to switch on and telemetry was received,” said Wolfgang Hell, ESA’s Service Manager for Phobos–Grunt. Telemetry typically includes information on the status and health of a spacecraft’s systems. “The signals received from Phobos–Grunt were much stronger than those initially received on 22 November, in part due to having better knowledge of the spacecraft’s orbital position.”

The second pass was short, and so was used only to uplink commands – no receipt of signal was expected. However, the following three passes in the early morning of 24 November proved to be more difficult: no signal was received from Phobos–Grunt.

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