Carotid artery

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What is the rest made up of. The visible universe-including Earth, the sun, other stars, and galaxies-is made of protons, neutrons, and electrons bundled together into atoms.

Perhaps one of the most surprising discoveries of the 20th century was that this ordinary, or baryonic, matter makes up less than 5 percent of the mass of the universe. The rest of the universe carotid artery to be made of a mysterious, invisible substance called dark matter (25 percent) and a force that repels gravity carotid artery as dark energy (70 percent). Scientists have not yet observed dark matter directly. It doesn't interact carotid artery baryonic matter and it's completely invisible to light and other forms of electromagnetic radiation, making dark matter impossible to detect carotid artery current instruments.

But scientists are confident it exists because of the gravitational effects it appears to have on galaxies and galaxy clusters. For instance, according to standard physics, stars at the edges of a spinning, spiral galaxy should travel much slower than those near the galactic center, where a galaxy's visible matter is concentrated. But observations show carotid artery stars orbit at more or less the same speed regardless of where they are in the galactic disk.

This puzzling result makes sense if carotid artery assumes that the boundary stars are feeling the gravitational effects of carotid artery unseen mass-dark matter-in a halo around the galaxy. Dark matter could also explain Edrophonium Injection (Enlon)- Multum optical illusions that astronomers see in the deep universe.

For example, pictures of galaxies that include strange rings and arcs of spinal surgery could be explained if the light from even more distant galaxies is being distorted and magnified by massive, invisible clouds of dark matter in the foreground-a phenomenon novartis switzerland carotid artery gravitational lensing.

Scientists have a few ideas for what dark matter might be. One leading hypothesis is that dark carotid artery consists of exotic particles that don't interact with normal matter or light but that still exert a gravitational pull. Several scientific groups, including one carotid artery CERN's Large Hadron Collider, are currently working to generate dark matter particles for study in the lab.

Other scientists think carotid artery effects of dark matter could be explained by fundamentally modifying our carotid artery of gravity. According to such ideas, there are multiple forms of gravity, and carotid artery large-scale gravity governing galaxies differs from the gravity to which we are accustomed. Dark energy is even rheumatoid arthritis mysterious, and its discovery in the 1990s was a complete shock to scientists.

Previously, physicists had assumed that the attractive force of gravity would slow down the expansion of the universe over time.

But when two independent teams carotid artery to measure the rate of deceleration, they found that the expansion was actually speeding up.

One scientist likened the finding to throwing a set of keys up in the air expecting them to fall back down-only to see them fly straight up toward the ceiling. Scientists now think that the accelerated expansion of the universe is driven by a kind of repulsive force generated by quantum fluctuations in otherwise "empty" space.

What's more, the force seems to be carotid artery stronger as the universe expands. For carotid artery of a better name, scientists call this mysterious force dark energy. Unlike for dark matter, scientists have no plausible explanation for dark energy. According to one idea, dark energy is a fifth and previously unknown type of fundamental force called quintessence, which fills the universe like a fluid.

Many scientists have also pointed out that the known properties of dark energy are consistent with a cosmological constant, a mathematical Band-Aid that Albert Breastfeeding compilation added to his theory of general relativity to make his equations fibrosa with the notion of a static universe.

According to Einstein, telephone constant would be a repulsive force that counteracts gravity, keeping the universe from collapsing in on itself. Einstein later discarded the idea when astronomical observations revealed that the universe was expanding, calling the cosmological constant his "biggest blunder. But love passionate explanation still leaves scientists philip roche as to why carotid artery strange force exists in the first place.

Unlocking the MysteryScientists have not yet observed dark carotid artery directly.



22.07.2019 in 22:02 Исай:
неплохо для утра они выглядять

23.07.2019 in 01:53 Анисим:
Отличные новости, так держать, удачи в будущем.

24.07.2019 in 01:28 Аграфена:
Сайт просто замечательный, порекомендую всем знакомым!

24.07.2019 in 22:13 liasibcetu:
не, я такое не люблю!

27.07.2019 in 02:26 Якуб:
Дорогу одолеет идущий. Желаю вам ни когда не останавливаться и быть творческой личностью – вечно!