How do we know that there are planets?

Few of the newly discovered planets outside our solar system have been observed directly. Astrophysicists discover them by how they are the star that they respond to orbit.

Subtle changes in the way that the star behaves say that something is there. There are various types are used to find them.

Doppler wobble. The attraction of a star with a planet produces a vibration. As the star moves slightly towards and away from the Earth changes in the light spectrum. This discrepancy between the wavelengths that can be measured and shorter and can reveal the mass of the planet.

Transits. A planet passing by the star’s light is dimmed. This may tell us that the diameter of the planet, the orbital period and sometimes the atmosphere.

Astrometry. The severity of a very large planets like Jupiter or even larger planet pulls the star. That makes him go and if it is far enough, we can do this against the background stars to be measured.

Direct imaging. Blocking light from a star can give a picture of the planet. These pictures were taken of another planet Fomalhaut b and b CHa called CT.

Micro gravitation lenses. Act like a lens, a planet passing another star can bend the light from a star in the distance behind her.

Soap Bubble Effect

Isaac Asimov was probably one of the first people to lump the universe of nodes present in the light and bright interior. Others say it looks like soap bubbles, a good description and we will focus on the bright knots in the area of ??the bubbles, because they are galaxies.

Imaging the Universe blackout

It is clear that the universe is still appearing before us. Everything happened but we are happy to talk about large scale, in millions and billions of years. And when we look at the night sky, everything is so quiet and still. But we know that this is an illusion. This is made clear by the idea that all galaxies emit beyond our own cease-fire, light today to the test. If we could live long enough, we would not see anything in a hundred years, but thousands, and even better, millions of years, the light begins to fade, and fills the blackout would end after 12000000000 years the universe.

Safe travel Galactic

Now that we know the size of the universe, we are a little smaller. Our own galaxy. Just a point on an image when some foreigners watching us on the edge of the universe. If we can imagine a lead of something so huge. So great, that if we at the speed of light we travel for about 200,000 years to travel, to go to the other end of our own galaxy. If our galaxy is not good enough, we go further, and after 2 million years we will reach our neighbors in space, the Andromeda galaxy.

Saving for the speed at

It is unlikely, possible, at the speed of light, so that we slow down our journey to one-fifth of the speed of light. Now we need 800,000 years to get to the end of our galaxy, visit to 23 million years ago and Andromeda. For some time we have not moved further than the house of a neighbor in our galaxy.

The universe is big and we are in him, we can not really see how we have wished. But with the help of scientists and visionaries such as Isaac Asimov, we can imagine, to the point where we think we can see. However, try to even imagine this place, we must try to disassemble it so that we can understand. That is, if we imagine the speed of light is moving and there are millions of years traveling without their own yard space. We still have a long way to go, but we can be proud that we have so shown great progress since the day the church asked to admit Galileo’s heresy. The universe is huge and only a small part of our galaxy. Our sun is also less important, but it is our sun, our hope.

Magnification

Is to work on the magnification achieved by using a special eyepiece, use the following formula:

Telescope focal length / eyepiece focal length

For example, if your telescope has a focal length of 650 mm, such as the Sky-Watcher Explorer 130P, and you use an eyepiece with a focal length of 10 mm, the magnification will result in:

650/10 = 65x

If you are using a Barlow lens, see below, the magnification up to 130x, 195x doubled or tripled.

Size of the cylinder

Barrel sizes are also available, either 1.25 inch or 2 inches in diameter. Adapters are available for both, where you have designed a 1.25-inch eyepiece of a telescope for 2 inch eyepieces, and vice versa.

Focal length

It is measured in millimeters, and it is, the wider field of view, but the lower part of the expansion. Short focal lengths are used for high magnification, whereas long been used to obtain a large field of view.

Eye Relief

If you wear glasses, you can offer long eye relief eye. That means you do not need to place your right eye to the eyepiece to see anything. The shorter the focal length, the shorter the distance between the exit pupil.

Barlow

A Barlow lens is a special kind of eyes that will double or triple the magnification. It is used between the cylinder and telescopic eyepiece.

How much do I need eyepieces?

A range of magnifications, say, 20x to 300x cover, you usually have four to five eyes and a Barlow lens. It is also best to go for good quality eyepieces. If you buy more cheaply, you can only conclude that you have to go and buy new, more expensive later.

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