Category: Science

Tadpole Nebula

Astronomy, Science

The Star Formation In The Tadpole Nebula:

IC410 is a dusty emission nebula located in the constellation of Auriga at about 12.000 ly from Earth. It is part of a larger star forming region that also contains the Flaming Star Nebula. The gas structures in this picture are lit by the radiation from the open star cluster NGC1893 that lies in the center of the nebula. This star cluster is about 4 million years old, but in astronomical terms it is still very young, with hot, massive stars. At the top-left of the star cluster two more dense structures are visible. These are similar to the famous Pillar of Creation and they are composed of dust and gas leftover from the formation of the star cluster and are very likely to give birth to more stars in the future. As can be seen in the picture, these structures point away from the center of the nebula. This is because of the stellar winds and radiation pressure from the stars in NGC 1893. Due to these structure’s shape, the nebula is also called the Tadpoles Nebula.

La Silla Observatory

Astronomy, Science

Our magnificent Milky Way galaxy is radiant over La Silla Observatory. The ESO 3.6-metre telescope is shown to the right, now home to the world’s foremost extrasolar planet hunter: High Accuracy Radial velocity Planet Searcher (HARPS), a spectrograph with unrivalled precision.

Photo Credit: ESO/B. Tafreshi

Agnostic Atheism

Atheism, Counter Culture, Religion, Science, Secular Humanism

Concept of the day:

Agnostic Atheism: as anyone fluent in the contemporary debate between atheists and theists knows, is common parlance among nonbelievers. Roughly, the idea here is that when one uses the term “atheist” they’re making reference to their belief, whereas when one uses the term “agnostic,” they’re making reference to their knowledge. In this way, so the argument goes, one can be an atheist in the sense that they don’t believe that God exists (or that they positively believe that God does not exist) but nevertheless be an agnostic in the sense that they don’t know, or claim to know, that God does not exist.

Further, there is an additional distinction that is made between soft (or weak) atheists and hard (or strong) atheists. On the one hand, soft atheists are those who claim only to lack belief in God. On the other hand, hard atheists are those who claim to know or believe that God does not exist.

Now, descriptively speaking, this taxonomy seems to correspond pretty closely to the way that many atheists now days construe their atheism. So, as far as semantics go, this seems correct. However, and I say this as an atheist, in terms of its philosophical rigor, this construal of atheism seems a bit lacking. To demonstrate this, try to imagine an atheist using the distinction between atheism and agnosticism, as well as the distinction between soft and hard atheism, with respect to any other conception of god apart from the standard, Western monotheistic conception. That would be peculiar, would it not? So, the question is why don’t we atheists bother to qualify our rejection of Zeus or Odin with the caveats of agnosticism and a mere lack of belief? And if we don’t need to do this, why, then, must we do this with respect to the god of Christianity?

Well, frankly, I don’t think we need to. The mere fact that I don’t know *for certain* that Zeus doesn’t exist does not mean that I have to be an agnostic with respect to his existence, any more than the fact that I can’t know for certain that I’m not just a brain in a vat means I have to be agnostic about whether or not I’m just a brain in a vat. In other words, the sort of certainty that agnostic atheists point to in order to distinguish between their atheism and their agnosticism is itself based on a rather sophomoric understanding of epistemology that is quickly done away with by the slightest of philosophical inquiry. I may not know for certain that God does not exist, but this is not at all to say that I’m not entirely rational in going ahead and affirming my belief in the nonexistence of God all the same. And I don’t have to call myself an agnostic while doing so.

Sources: Atheist Republic

#NotAttackingReligion #FreedomOfBelief #JustSomeClarification

Pine Island Glacier Reaching Tipping Point

Climate Change, Earth Science, Science

Researchers have confirmed for the first time that Pine Island Glacier in West Antarctica could cross tipping points, leading to a rapid and irreversible retreat which would have significant consequences for global sea level.

Pine Island Glacier is a region of fast-flowing ice draining an area of West Antarctica approximately two thirds the size of the UK. The glacier is a particular cause for concern as it is losing more ice than any other glacier in Antarctica.

Currently, Pine Island Glacier together with its neighbouring Thwaites glacier are responsible for about 10% of the ongoing increase in global sea level.

Scientists have argued for some time that this region of Antarctica could reach a tipping point and undergo an irreversible retreat from which it could not recover. Such a retreat, once started, could lead to the collapse of the entire West Antarctic Ice Sheet, which contains enough ice to raise global sea level by over three metres.

While the general possibility of such a tipping point within ice sheets has been raised before, showing that Pine Island Glacier has the potential to enter unstable retreat is a very different question.

Now, researchers from Northumbria University have shown, for the first time, that this is indeed the case.

Their findings are published in leading journal, The Cryosphere.

Using a state-of-the-art ice flow model developed by Northumbria’s glaciology research group, the team have developed methods that allow tipping points within ice sheets to be identified.

For Pine Island Glacier, their study shows that the glacier has at least three distinct tipping points. The third and final event, triggered by ocean temperatures increasing by 1.2C, leads to an irreversible retreat of the entire glacier.

Sources: Phys.org

The Plagues: Evidence or No Evidence

Anthropology/Archaeology, Israel, Jewish Holy Books, Judaism, Religion

Date: 13th century BCE

Discovered: Saqqara, Egypt

Period: Exodus

Torah Passage: Exodus 7:14–12:36

I will strike the water that is in the Nile with the staff that is in my hand, and it will be turned to blood…and the blood was through all the land of Egypt (Exodus 7:17,21).

An ancient Egyptian text, written by a man named Ipuwer and referred to as the Admonitions of an Egyptian Sage, was a poetic lamentation addressed to the “All Lord,” who is typically understood to be the sun god Ra. The poem describes a time in which the natural order in Egypt was severely disrupted by death, destruction, and plagues.

The only surviving copy of the papyrus dates to the 13th century BCE, perhaps as early as 1300 BCE. While most scholars suggest it was originally written in the Second Intermediate Period due to content, the linguistics of the text and the date of the copy indicate that it was composed during the 18th Dynasty around the 16th–14th centuries BCE.

The name Ipuwer is also know from inscriptions of the 18th Dynasty, and in particular one from the time of Hatshepsut and Thutmose III just prior to the Exodus. Any historical events mentioned in the text must have occurred prior to the 13th century BCE and possibly in the 18th Dynasty. If the Admonitions describes events similar to the plagues recorded in Exodus, and the Egyptian account was composed in the same general time period as the events of the Exodus, then it is plausible that the two documents contain independent accounts of the identical episode in history but from different perspectives.

Passages in the poem, such as the river being blood, blood everywhere, plague and pestilence throughout the land, the grain being destroyed, disease causing physical disfigurement, the prevalence of death, mourning throughout the land, rebellion against Ra the sun god, the death of children, the authority of the pharaoh being lost, the gods of Egypt being ineffective and losing a battle, and jewelry now being in the possession of the slaves, are all occurrences in common with the Exodus story.

Thematic and even linguistic links between the Admonitions and the plagues of Exodus have been recognized by scholars, but typically these connections are discounted on the presupposition that neither the book of Exodus nor the Admonitions of Ipuwer describe historical events, and that even if they did, the two texts would be too far separated in time from one another.

However, since the chronology may overlap, and the match in specificity of many of the events suggests the possibility that the documents are describing the same general events and period of hardship in Egypt, the Admonitions could be an Egyptian remembrance and near contemporary account of the time of the Exodus plagues.

Sources: Essential Judaism, Unearthing the Bible, myjewishlearning.com, Chabad.org.

InSight Detects Two Quakes

Astronomy, Astrophysics, Human Space Travel, Science

NASA’s InSight lander has detected two strong, clear quakes originating in a location of Mars called Cerberus Fossae—the same place where two strong quakes were seen earlier in the mission. The new quakes have magnitudes of 3.3 and 3.1; the previous quakes were magnitude 3.6 and 3.5. InSight has recorded over 500 quakes to date, but because of their clear signals, these are four of the best quake records for probing the interior of the planet.

Studying marsquakes is one way the InSight science team seeks to develop a better understanding of Mars’ mantle and core. The planet doesn’t have tectonic plates like Earth, but it does have volcanically active regions that can cause rumbles. The March 7 and March 18 quakes add weight to the idea that Cerberus Fossae is a center of seismic activity.

“Over the course of the mission, we’ve seen two different types of marsquakes: one that is more ‘Moon-like’ and the other, more ‘Earth-like,'” said Taichi Kawamura of France’s Institut de Physique du Globe de Paris, which helped provide InSight’s seismometer and distributes its data along with the Swiss research university ETH Zurich. Earthquake waves travel more directly through the planet, while those of moonquakes tend to be very scattered; marsquakes fall somewhere in between. “Interestingly,” Kawamura continued, “all four of these larger quakes, which come from Cerberus Fossae, are ‘Earth-like.'”

The new quakes have something else in common with InSight’s previous top seismic events, which occurred almost a full Martian year (two Earth years) ago: They occurred in the Martian northern summer. Scientists had predicted this would again be an ideal time to listen for quakes because winds would become calmer. The seismometer, called the Seismic Experiment for Interior Structure (SEIS), is sensitive enough that, even while it is covered by a dome-shaped shield to block it from wind and keep it from getting too cold, wind still causes enough vibration to obscure some marsquakes. During the past northern winter season, InSight couldn’t detect any quakes at all.

“It’s wonderful to once again observe marsquakes after a long period of recording wind noise,” said John Clinton, a seismologist who leads InSight’s Marsquake Service at ETH Zurich. “One Martian year on, we are now much faster at characterizing seismic activity on the Red Planet.”

Sources: Phys.org

Ubuntu

Africa, Anthropology/Archaeology, Travel

An anthropologist showed a game to the children of an African tribe:

He placed a basket of delicious fruits near a tree trunk and told them: The first child to reach the tree will get the basket.

When he gave them the start signal, he was surprised that they were walking together, holding hands until they reached the tree and shared the fruit!

When he asked them why you did that when every one of you could get the basket only for him!

They answered with astonishment: Ubuntu.

“That is, how can one of us be happy while the rest are miserable?”

Ubuntu in their civilization means: (I am because we are).

That tribe knows the secret of happiness that has been lost in all societies that transcend them and which consider themselves civilized societies.