Outer Space

Outer Space is comprised of the relatively empty regions of the universe out side the atmospheres of the celestial bodies (for instance, Earth, or the other planets in our solar system). Outer space is used to distinguish from airspace and terrestrial locations, it is not completely empty but contains low density particles as well as dark energy and dark matter.

Outer Space

Outer Space

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Outer Space

Outer Space

Space is the closest form to a perfect vacuum that has been found. It has no friction, which allows all of the celestial objects within it to move along at whichever gravitational trajectory it is a part of.

The Celestial objects keep their atmospheres by adhering to their gravitational attraction. Every gravitational field has a different density. For instant, the Earth's atmospheric gas simply decreases withdistance from the object. The Earth's atmospheric pressure drops to about 1 Pa (10-3 Torr) at 100 km of altitude, which is a common definition of boundary in the outer space. The observable universe is filled with photons which are the cosmic background radiation which has an equally correspondingly number of neutrinos.

The atmospheric density within outer space produces drag on satellites. Most artificial satellites in low Earth orbit to deal with this drag, and fire their engines every few days to maintain orbit. Planets are too massive to be affected by the drag of the Solar System.

Outer Space

Sensational Gifts for a 19-Year-Old's Birthday

Are you looking for some sensational gifts for a 19-year-old's birthday? If the answer is "yes," then pull up a chair, pour yourself some coffee, and stay tuned. Because we are about to check out the coolest birthday gifts around.

Sensational Gifts for a 19-Year-Old's Birthday

Sensational Gifts for a 19-Year-Old's Birthday

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Sensational Gifts for a 19-Year-Old's Birthday

Sensational Gifts for a 19-Year-Old's Birthday

Room -Chances are good that a 19-year-old would really like a great room. A digital still camera with a 5 x optical zoom-lens and a 3-inch LCD screen might be just the thing. An optical stabilization and 1 GB of memory helps produces professional looking pictures. The room should be light-weight and runs on a rechargeable battery.

Portrait -Nineteen is the best age ever to have your portrait painted. Surely you want those flashing eyes, that firm jaw and that immortalized on canvas dashing nose. There are excellentportrait painters in every price range. You can find first class portrait artists through galleries and at art schools.

Telescope -telescope gives you a fascinating bird's eye view of constellations and stars. Most telescopes today are computerized and many come with GPS to let you know your position in relation to the stars. The built-in software makes it easy to identify celestial bodies. A gift like this can provide years of enjoyment.

Jewelry or Accessories -Now here is a gift to bring a smile to the face of any 19-year-old. For a girl, a pearl necklace or a necklace of gold beads is a gift of simple elegance. Later you may want to add to this a pair of matching earrings or a bracelet. For a boy, a pair of gold cufflinks engraved with his initialsmight be exactly what he wants. Or, consider giving him a waterproof watch that shows the time, date and day and is equipped with an alarm.

Travel Radio -This is a great "friend" to bring along on a trip. It is a welcome companion when hiking, boating or traveling. An excellent travel radio includes an AM/FM radio, cell-phone charger, and flashlight. The radio should be hand-powered as well as run on batteries and electricity. This radio should be fairly light-weight and it should slide easily into a backpack or carry-on luggage.

Sensational Gifts for a 19-Year-Old's Birthday