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Seventh Grade visited the National Observatory, located in the Capital. There

could interact and explore tools that have been used to learn about our galaxy since ancient times. Here we share with

DUs a photo album, where the photographic record was carried out by teachers and students.

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stars and their light

When we observe a star, is the information we receive from it for the past or the future? Why?

Light is measured in light years, which is the distance light travels in one year. The information we receive to see a star of the past, because he left, traveled some "light years" to get us to see her walking the great distances of space.

For example, a ray of light from the Sun would take 30 000 years to reach the center of our galaxy

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Galaxy ...

Galaxies are huge groups of hundreds or thousands of millions of stars, all gravitationally interacting, and orbiting around a common center.
Galaxies contain:

• stars planets star clusters
• atomic hydrogen
• molecular hydrogen complex molecules composed of hydrogen, nitrogen, carbon and silicon and other elements
• cosmic rays.

classes of galaxies are:
spirals (Sa, Sb, Sc),
barred spirals (SBa, SBb, SBc),
elliptical (E0 to E7),
SO (intermediate between S and E)
irregular.

We belong to a spiral galaxy (a Sb) containing obscuring dust and interstellar gas, with many young blue stars in the spiral arms, and old red stars in the core.

instead Ellipticals have little interstellar material, and few young stars. Tend to have sizes of tens of thousands of light years. Their distances are measured by various methods, including Cepheid variable stars. These stars change in brightness in such a way that it is possible to calculate the distance, and hence of the galaxy that contains them. At the core
apparently all contain a huge black hole.