background preloader

Earth & Science

Facebook Twitter

The Copernican Model: A Sun-Centered Solar System. Solar System. Our Solar System: One in a Hundred Billion?

Solar System

Planet Earth is part of a vast space neighborhood called the solar system. Our solar system is an amazing place. It’s even more amazing that at least 70 other solar systems have been discovered. And there could be lots more. Scientists estimate there could be hundreds of billions of solar systems in our Milky Way galaxy. Scientists, telescope hunt massive hidden object in space. You know how you sometimes can sense that something is present even though you can't see it?

Scientists, telescope hunt massive hidden object in space

Well, astronomers are getting that feeling about a giant, hidden object in space. And when we say giant, we mean GIANT. Evidence is mounting that either a brown dwarf star or a gas giant planet is lurking at the outermost reaches of our solar system, far beyond Pluto. Sun, Sun Information. Compared with the billions of other stars in the universe, the sun is unremarkable. But for Earth and the other planets that revolve around it, the sun is a powerful center of attention. It holds the solar system together; pours life-giving light, heat, and energy on Earth; and generates space weather. The sun is a big star. What causes seasons? I am curious as to why there are seasons.

What causes seasons?

The Sun - Center of the Solar System. Planet Earth seen from space (Full HD 1080p) ORIGINAL. The Moon. The following questions were answered by astronomer Dr.

The Moon

Where did the moon come from? The origin of our Moon has long been a mystery.

Where did the moon come from?

Although there are 3 plausible theories, they rely on knowing about what the Moon is made from. It was not until samples of the Moon were brought back during the NASA Apollo missions in the 1960s and early 1970s that one theory became most likely. Theories There are 3 likely theories as to how the Moon formed: SMART-1 - Where did the Moon come from?

Where did the Moon come from?

SMART-1 - Where did the Moon come from?

The fashionable theory is that the Moon is the result of a collision during the birth of the Solar System 4500 million years ago. When the Earth was nearly complete, a gigantic wandering asteroid the size of Mars supposedly collided with our planet, flinging vapourised rock and debris from both bodies into space. [astro-ph/0405372] Where Did The Moon Come From? How did Earth get its moon? Where did the Moon come from? Why do We See only One Side of the Moon? Relative to the Earth, the Moon makes one rotation every 29.5 days.

Why do We See only One Side of the Moon?

That happens to also be the time it takes for the Moon to complete one revolution around the Earth. This might seem like a coincidence, but it's not. Reasons for the Seasons. By Jon Kahl (figures from Jack William's The USA Today Weather Book) Are the seasons caused by the distance between the sun and the earth?

Reasons for the Seasons

Is winter colder because during that season the earth is farther away from the sun? The amount of sunlight the earth receives is called insolation: incoming solar radiation Two factors cause insolation to change. Why are summer days longer and winter days shorter? Inside the Earth [This Dynamic Earth, USGS] The size of the Earth -- about 12,750 kilometers (km) in diameter-was known by the ancient Greeks, but it was not until the turn of the 20th century that scientists determined that our planet is made up of three main layers: crust, mantle, and core.

Inside the Earth [This Dynamic Earth, USGS]

This layered structure can be compared to that of a boiled egg. The crust, the outermost layer, is rigid and very thin compared with the other two. Beneath the oceans, the crust varies little in thickness, generally extending only to about 5 km. Reasons for the Seasons. The Seasons. Coriolis Effect - An Overview of the Coriolis Effect.

The Coriolis effect (also called the Coriolis force) is defined as the apparent deflection of objects (such as airplanes, wind, missiles, and ocean currents) moving in a straight path relative to the earth's surface.

Coriolis Effect - An Overview of the Coriolis Effect

Light Years Away. Best Results From Yahoo Answers Youtube From Yahoo Answers Question:I'm simply curious about the density of stars in Earth's little part of the galaxy. Answers:In the sun's immediate neighborhood, there's about 1 star for every 280 cubic light years. So there should be about... 1875 stars within 50 light years 15000 stars within 100 light years 1875000 stars within 500 light years On the average, of each 1000 main sequence stars in the sun's neighborhood, there are... 1 star of spectral type B 7 stars of spectral type A 27 stars of spectral type F 65 stars of spectral type G 126 stars of spectral type K 774 stars of spectral type M In addition to the main sequence stars, there will be a few white dwarves.

Also, there are lots of objects too small to be stars. Question:I saw an article today that said scientists have found out about an earth like planet 20.5 light years away. Answers:Yes it would 100 years to fade. Answers:Yes, that is correct. 1001.0785v1. A Physicist Proposes a New Theory of Gravity—Gravity Does Not Exist. [PureInsight.org] Many people have heard the story of when Newton sat under an apple tree to think, and suddenly an apple fell on his head and he conceived the theory of gravity. But after a long time, physicists knew gravity was a very strange physical law. Compared to other basic interaction forces, gravity was very difficult to deal with. Now the reasons for this peculiarity may have been explained: gravity is not a fundamental interaction force, but instead may be the derivative of another more fundamental power. Professor Eric Verlinde, age 48, a respected string theorist and a professor of physics at the Institute of Theoretical Physics at the University of Amsterdam, proposed a new theory of gravity as reported by the New York Times on July 12, 2010.

Carl Friedrich Gauss. Johann Carl Friedrich Gauss (/ɡaʊs/; German: Gauß, pronounced [ɡaʊs]; Latin: Carolus Fridericus Gauss) (30 April 1777 – 23 February 1855) was a German mathematician who contributed significantly to many fields, including number theory, algebra, statistics, analysis, differential geometry, geodesy, geophysics, mechanics, electrostatics, astronomy, matrix theory, and optics. Sometimes referred to as the Princeps mathematicorum[1] (Latin, "the Prince of Mathematicians" or "the foremost of mathematicians") and "greatest mathematician since antiquity," Gauss had an exceptional influence in many fields of mathematics and science and is ranked as one of history's most influential mathematicians.[2] Early years[edit] Gauss was a child prodigy. There are many anecdotes about his precocity while a toddler, and he made his first ground-breaking mathematical discoveries while still a teenager.

The year 1796 was most productive for both Gauss and number theory. Middle years[edit] How are astronomers able to measure how far away a star is?"