Planetary Nebula Abell 39

Let's look at a planetary nebula nearly perfect spherical shape, whose name Abell 39 (Abell 39).

Today in our galaxy "Milky Way" is known more than 1500 planetary nebulae that are astronomical substance consisting of ionized gas shell and the central star - a white dwarf. Planetary nebulae are fast in astronomical terms the phenomenon, which lasts only a few tens of thousands of years. For comparison, the life of the parent star is a few billion years.

The universe is increasing, what threats the Earth

NASA Jet Propulsion Laboratory reported that the astronomers who work with the Space Telescope, "Spitzer", were able to conduct a more accurate calculation of the rate of increase in the history of astronomy. In other words, this swiftness is called the Hubble constant.

We live on a small planet Earth, but this does not preclude our interest in the rest of the world. But to know the size of this huge, compared to us, the world, to find out what the age and expansion rate of the universe has. More recently, you can also add the concept of "acceleration of the expansion." But the accelerated expansion of the universe, you can still stick to the linear Hubble law.

Draconid meteor shower reaches peak activity on Monday

Draconid meteor shower on Monday to reach peak activity, although this time, astronomers do not expect a "star storm" as last year, but it is possible that this meteor shower will present scientists surprises. Meteors occur when the atmosphere and there are burn microscopic dust particles. Meteor streams or Star rain associated with the passage of the Earth through the dust, who reserves the comet.