Describing the Universe

The Electromagnetic spectrum & Telescopes

What is astronomy?

Astronomy is the study of the sun,moon,stars,planets,comets,gas,galaxies, and dust. NASA defines astronomy as simple as "the study of stars,planets and space." To put it shortly Astronomy is the scientific study of the universe.

Objectives

1. characteristics of the universe in terms of time,distance,and organization.

The part of the universe closest to earth is the solar system. This system comprises of earth, the sun and many other planets. It also contain smaller objects such as dwarf planets,asteroids, and comets. The solar system is part of a galaxy which is an assembly of stars,dust and gases. The Milky Way Galaxy is where the solar system is.

2. the visible and no visible parts of the electromagnetic spectrum.

The visible light spectrum is a fractional part of the electromagnetic spectrum,which is visible to the human eye,which are light receptors. Invisible spectrum are things like UV spectrum which falls outside the human visible range. Visible light waves are the only electromagnetic waves we can see. It's on the spectrum because it travels in electromagnetic waves.

3. refracting telescopes and reflecting telescopes.

Reflecting telescopes use lenses to gather and focus light from distant objects. Refractive telescopes have objective lens that bends light that passes through the lens and focuses on the light.Reflecting telescope use mirrors instead of lenses to gather and focus light.


vocabulary

Difference between an Astronomical Unit and a light year.

there is a great difference an astronomical unit and a light year. astronomical unit is the distance between the earth and sun which is 150 million kilometers and a light year is the distance that light travels in one year. The difference would be about 6 trillion miles.

Describing the electromagnetic spectrum

The electromagnetic spectrum is all of the wavelengths of electromagnetic radiation. The electromagnetic spectrum consists of energy radiated as waves, through matter or open space. Light,radio waves, and X rays are all examples of electromagnetic radiation. This radiation is the form of subsided waves composed of both electric and magnetic fields.

Invisible light telescope

Refracting and Reflecting telescopes are used to detect invisible light. Invisible light telescopes can detect gamma rays,x-rays and infrared rays. water vapor can prevent gamma rays,x-rays,infrared rays and ultraviolet rays.

compare the visible and invisible spectrum

The visible light spectrum is a fractional part of the electromagnetic spectrum, which is visible to the human eye,which are light receptors. the human eye can only see radiation wave lengths in the visible light range of the spectrum. Visible light is broken into different colors and each color has a different wave length. Colors can be seen when the light passes through a prism. Invisible light spectrum are things like UV spectrum which falls out of the human visible range.Infrared radiation has waves that are longer than waves of the visible light. Visible light waves are the only electromagnetic waves we can see. Its on the spectrum because it travels in electromagnetic waves.

compare the reflecting & refracting telescopes

A Reflecting telescope uses the reflection of light as its method of focus. A Refracting telescope uses the refraction of light as its method of focus. Reflecting telescopes are much more useful than Refracting telescopes,as chromatic Abberation is not an issue, and have a significantly larger range than a refracting telescope. Nearly all observations have reflectors in them, as they are much more practical. Refracting telescopes use lenses to gather and focus light form distant objects. Refracting telescopes have objective lens that bends light that passes through the lens and focuses on the light. Reflecting telescopes use mirrors instead of lenses to gather and focus light from distant objects. Light is reflected by a large curved mirror to a second mirror. The second mirror reflects light to the eye piece,which is a lens that magnifies and focuses that image.

Spaced based telescopes

There is a space telescope called "The Hubble" space telescope. The Hubble collects electromagnetic radiation form objects in space. There are other space telescopes like the Chondo x-ray observatory, it makes clear images using x-rays from objects in space. There is also the Spitzer space telescope it detects infrared radiation.

Hubble space telescope