22 dezembro 2017
Phaethon s Brood
Based on its well-measured orbit, 3200 Phaethon (sounds like FAY-eh-thon) is recognized as the source of the meteroid stream responsible for the annual Geminid meteor shower. Even though most meteor showers' parents are comets, 3200 Phaethon is a known and closely tracked near-Earth asteroid with a 1.4 year orbital period. Rocky and sun-baked, its perihelion or closest approach to the Sun is well within the orbit of innermost planet Mercury. In this telescopic field of view, the asteroid's rapid motion against faint background stars of the heroic constellation Perseus left a short trail during the two minute total exposure time. The parallel streaks of its meteoric children flashed much more quickly across the scene. The family portrait was recorded near the Geminid meteor shower's very active peak on December 13. That was just before 3200 Phaethon's historic December 16 closest approach to planet Earth.
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Bamboos are the fastest-growing plants on earth. Trees such as...
Bamboos are the fastest-growing plants on earth. Trees such as oak or apple can take up to 120 years to reach maturity. Most bamboo trees take 5 to 7 years to reach maturity. Yet apple trees bloom every year. Bamboo blooms once every 60 to 130 years!
And, even more mysteriously, all the bamboo of that species bloom at the same time. All over the world, from Japan to France to the USA. And records from China dating to 919 CE tell us this has been happening for a long, long time. It is as if the plants carry an an internal clock ticking away until the preset alarm goes off simultaneously. This mass flowering phenomenon is called “gregarious flowering.” And botanists are still stumped as to why, exactly, bamboo does this –although of course there are plenty of hypotheses!
forumgamer: historical-nonfiction: The Czech Republic is landlocked, so to try and get access to the...
The Czech Republic is landlocked, so to try and get access to the sea, it leases a section of the port in Hamburg, Germany. The lease, which was mandated by the Treaty of Versailles after World War I, is for 99 years – and it still has ten years to go!
It’s worth noting that Hamburg is not only Germany’s primary port, but also not located at the coast either, but at the Elbe, Germany’s second-largest river. This river flows all the way to the Czech Republic, and is (to some degree) shippable, so there’s a reason why Hamburg was chosen as the location.
Microfósseis sugerem que a vida alienígena pode ser comum no universo
Os cientistas identificaram um grupo diversificado de organismos dentro de fósseis que remontam a 3,45 bilhões de anos.
Em um novo relatório publicado na revista Proceedings of the National Academy of Sciences, cientistas da UCLA e da Universidade de Wisconsin-Madison delinearam a descoberta de vários organismos distintos do passado distante da Terra.
Isso inclui dois que realizaram uma forma primitiva de fotossíntese, uma que produziu gás metano e outro que consumiu metano para o ajudar a desenvolver.
A presença de uma gama tão diversificada de organismos tão cedo na história da Terra sugere que é extremamente improvável que a vida não tenha surgido em outros planetas também.
“3.465 bilhões de anos atrás, a vida já era diversificada na Terra, é claro – os fotossintetizadores primitivos, os produtores de metano, os usuários de metano”, disse o autor principal do estudo, J. William Schopf.
“Estes são os primeiros dados que mostram os organismos muito diversos naquela época na história da Terra, e nossa pesquisa anterior mostrou que havia usuários de enxofre há 3,4 bilhões de anos também”.
“Isso nos diz que a vida deve ter começado substancialmente mais cedo e confirma que não era difícil para a vida primitiva se formar e evoluir para micro-organismos mais avançados”.
“Se as condições estiverem corretas, parece que a vida no universo deve ser generalizada”.
The Czech Republic is landlocked, so to try and get access to the sea, it leases a section of the...
The Czech Republic is landlocked, so to try and get access to the sea, it leases a section of the port in Hamburg, Germany. The lease, which was mandated by the Treaty of Versailles after World War I, is for 99 years – and it still has ten years to go!
Hubble's Holiday Nebula “Ornament”
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Visit –> http://ift.tt/2yWn7SA to read a classic article by Ivan Pavlov on the physiological vs. psychological nature of conditioning.
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