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Showing posts with label question. Show all posts
Showing posts with label question. Show all posts
Dark Matter Theory Is Questioned
Dark matter holds the universe together right? Well, the theory of dark matter may be widely believed, but there isn't much of it in our part of the universe. The research team puts forward its findings. Believers question the accuracy of what they have found.
This isn't a question of how much is out there. The team found no dark matter at all. The dark matter theory holds that dark matter should be plentiful, everywhere. As much as 85 per cent of everything should be dark matter. The sun should be pulled around with dark matter. Unfortunately, scientists cannot find it.
Dark matter theory is based on the premise that stars trapped in a gravitational well light years away travel at a fixed speed. This, with the shape of the well allows a calculation to be made. Star counts give the amount of ordinary matter. subtracting this from the mass determined from the calculation gives the amount of dark matter.
The team found that the dark matter theory was questionable. The speed of the stars did not need dark matter to explain it.
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Science
Whales Took an Evolutionary Leap Forward
Eons ago ancestors of whales made a major leap forward in evolution of their mouths. Whales living today can filter-feed in large amounts because the lower jaw is flexible in movement.
Ancient fossils such as Janjucetus hunderi do not have such a mobile lower jaw. The development of this attribute probably initially evolved to consume large living prey. It began with a wide upper jaw and normal teeth - no comb filters. Erich Fitzgerald from the Museum Victoria in Melbourne has created a family tree showing whale evolution.
The way whales feed is unique. It is believed that sucking when feeding still takes place, a left over from the days of the wide upper jaw.
A big question is why whales went back into the sea in the first place.
Ancient fossils such as Janjucetus hunderi do not have such a mobile lower jaw. The development of this attribute probably initially evolved to consume large living prey. It began with a wide upper jaw and normal teeth - no comb filters. Erich Fitzgerald from the Museum Victoria in Melbourne has created a family tree showing whale evolution.
The way whales feed is unique. It is believed that sucking when feeding still takes place, a left over from the days of the wide upper jaw.
A big question is why whales went back into the sea in the first place.
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Anthropology
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