We’ve been told recently that two thirds of the universe consists of a mysterious phenomenon called dark energy. Now, some scientists at ESA say it doesn’t exist. Observations by the European Space Agency’s XMM-Newton X-ray Observatory of clusters of galaxies 10 billion light years distant show remarkable differences from nearby clusters in the amount of X-ray energy emitted. One interpretation is that dark energy is not needed to explain their structure, because they appear too dense, and emit more X-rays than expected by the “concordance model” that posits 70% dark energy. If confirmed, “we may have to rethink our understanding of the universe.”Related stories: 07/07/2003, 05/30/2001. Nevertheless (bad timing?), Science magazine Dec. 19 issue) and its editor Don Kennedy, convinced that “the data conclusively prove the existence of dark energy,” awarded the “discovery” of dark energy the journal’s “Breakthrough of the Year.” (This was probably voted on before the XMM-Newton telescope results were announced.)Models are playthings for theorists. They may or may not correspond to reality. Beware of popularizers who speak of models as facts. Cosmological facts obey Dunlap’s Laws of Physics: (1) Fact is solidified opinion. (2) Facts may weaken under extreme heat and pressure. (3) Truth is elastic.(Visited 21 times, 1 visits today)FacebookTwitterPinterestSave分享0
The headmaster of a primary school in Odisha’s Ganjam district was attacked and injured by an intruder on Tuesday during a cleaning exercise on the premises.The headmaster, Purna Chandra Das, was admitted to MKCG Medical College and Hospital in Berhampur. The incident happened at Gangadhar Primary School in Kavisuryanagar. The intruder, a youth in early 20s, was angry as the headmaster had engaged the school students in cleaning their classrooms, said sources. It is to be noted that Gangadhar Primary School has been adjudged the best school for cleanliness in Kavisuryanagar Notified Area Council. The headmaster, according to the sources, had asked two Class V students to clean their classroom. The accused saw this from outside and entered the campus to record it on his cell phone. He protested against students being used for cleaning work and entered into an altercation with the headmaster. He hit Mr. Das’s head with a boulder, injuring him seriously, the sources added. The headmaster has lodged a complaint at Kavisuryanagar police station but the culprit is yet to be arrested.Ganjam District Education Officer Sanatan Panda condemned the violent act and said that if the youth had any complaints he could have conveyed them to the authorities instead of taking the law into his own hands.“Under the ‘Swachh Vidyalaya’ drive going on in the district, students and teachers together clean their school campuses.