The probe will be approaching Earth at a very high speed. The easiest way to slow it down is the friction from the atmosphere on re-entry. Otherwise, in order to slow it to orbital speeds so that a shuttle could retrieve it, it would need to carry a rocket with a lot of fuel, which greatly increases the cost and complexity of the mission.
NASA: $16.2 billion (0.7% of the total federal budget)
Defense: $416.9 billion (17.4% of total). This does not include more than $100 billion on supplemental spending on the wars in Iraq and Afghanistan, and military expenditures in departments other than defense (the Department of Energy maintains the nuclear arsenal, for example).
5% of military spending could be shifted to the space program and more than double its budget. We could easily have manned colonies on Mars in less than a decade.
Both the Deep Impact spacecraft and comet Tempel 1 are in their own unique orbits around the Sun. However, the comet is traveling substantially faster (29.9 kilometers per second (66,880 miles per hour)) than the spacecraft (21.9 kilometers per second (48,990 miles per hour))....
the comet actually runs over it at a relative velocity of 10.3 kilometers per second (about 23,000 miles per hour).
Actually, the dollar sign is more likely originally from "PS", short for "peso". US$ is often used for "US dollar" because other countries also use the word "dollar" for their own currency unit. HK$, for example, is for Hong Kong Dollars.
No. The difference in the position of the nearest stars would be just detectable with a telescope, but it would be tiny.
On a scale model where the Earth is orbiting the Sun at a distance of 1 inch, Mars would be in a slightly larger orbit with a radius of 1.5 inches. Mars would be 0.5 to 2.5 inches away from Earth, depending on where the planets are in their orbit. The closest stars, however, would be over 4 miles away.
Light from the corona won't damage your eyes -- you can stare directly at a *total* solar eclipse. It's when the Sun is only partly covered that there is still a danger.
In 1845, a mathematician at Cambridge proposed the existence of another, unseen planet, due to pertubations in Uranus' orbit that couldn't be accounted for. He calculated its position, and Neptune was discovered the following year.
On the other hand, problems with Mercury's orbit turned out to be the effects of relativity, not an unseen mass.
So both approaches have historically worked. The idea of unseen mass distributed throughout the galaxy is not that far-fetched. After all, from light years away, nearly everything is invisible.
Slashdot Mirror
I usually check "Other" and write in "Human".
Why would that make you an immigrant? Aren't there people born in America who are considered African American based on their ancestry?
All it means is that you are an American with ancestors from Africa, which is true of every American.
The probe will be approaching Earth at a very high speed. The easiest way to slow it down is the friction from the atmosphere on re-entry. Otherwise, in order to slow it to orbital speeds so that a shuttle could retrieve it, it would need to carry a rocket with a lot of fuel, which greatly increases the cost and complexity of the mission.
NASA: $16.2 billion (0.7% of the total federal budget)
Defense: $416.9 billion (17.4% of total). This does not include more than $100 billion on supplemental spending on the wars in Iraq and Afghanistan, and military expenditures in departments other than defense (the Department of Energy maintains the nuclear arsenal, for example).
5% of military spending could be shifted to the space program and more than double its budget. We could easily have manned colonies on Mars in less than a decade.
http://www.spaceflightnow.com/deepimpact/050628mis sion.html
Actually, the dollar sign is more likely originally from "PS", short for "peso". US$ is often used for "US dollar" because other countries also use the word "dollar" for their own currency unit. HK$, for example, is for Hong Kong Dollars.
No. The difference in the position of the nearest stars would be just detectable with a telescope, but it would be tiny.
On a scale model where the Earth is orbiting the Sun at a distance of 1 inch, Mars would be in a slightly larger orbit with a radius of 1.5 inches. Mars would be 0.5 to 2.5 inches away from Earth, depending on where the planets are in their orbit. The closest stars, however, would be over 4 miles away.
Light from the corona won't damage your eyes -- you can stare directly at a *total* solar eclipse. It's when the Sun is only partly covered that there is still a danger.
That's right. The purpose is to allow price discrimination.
In 1845, a mathematician at Cambridge proposed the existence of another, unseen planet, due to pertubations in Uranus' orbit that couldn't be accounted for. He calculated its position, and Neptune was discovered the following year.
On the other hand, problems with Mercury's orbit turned out to be the effects of relativity, not an unseen mass.
So both approaches have historically worked. The idea of unseen mass distributed throughout the galaxy is not that far-fetched. After all, from light years away, nearly everything is invisible.