http://www.sfgate.com/business/investopedia/article/5-NASA-Missions-You-
Didn-t-Know-Were-Canceled-3950797.php

The days of big government funding of the space program are gone. At the
end of World War II, a new era of competition between the United States
and the Soviet Union began. Out of this Cold War came the Space Race.
Each side was eager to prove its technological dominance by being the
first to put a man on the moon. On July 20, 1969, Apollo 11 successfully
placed two astronauts on the moon, giving the United States the edge in
the Space Race.

Winning the Space Race wasn't cheap. The year of 1966 marked the largest
space expenditure in government history with nearly 4.5% of U.S.
government spending committed to NASA. From 1964 to 1967, more than 3%
was committed to winning the Space Race.

Since the days of the Cold War, government funding of NASA has slowly
declined. The 2012 projections call for only 0.5% of spending to go to
NASA. Numerous missions were canceled because of the falling budget
since the Cold War:

Pluto Kuiper Express
The Pluto Kuiper Express was a spacecraft that was planned for launch in
2004. It was slated to arrive at Pluto in 2012. The goal of the mission
was to study the Kuiper Belt that sat beyond Neptune. The price tag in
2000 was $350 million. This cost was too steep for Congress to stomach.
In 2006, plans to explore Pluto were again impacted when its status as a
planet was removed. However, later that year NASA launched a spacecraft
that will reach Pluto in 2015.

Mars Telecommunication Orbiter
In 2009, to service its growing population of rovers and other planned
science vehicles, NASA was to launch an orbiter to arrive in 2010 called
the Mars Telecommunication Orbiter. Its primary duty was to provide a
better means of communication between Mars and Earth. Think of it as an
upgrade to the planet's Wi-Fi system at a cost of $500 million. This
project was canceled in 2005 because NASA shifted priorities. No longer
was the anticipated volume of data enough to justify the high cost.

Comet Rendezvous and Asteroid Flyby
This project had big goals. This spacecraft, set to launch in 1995, was
going to perform an asteroid flyby, but it had the loftier goal of
piggybacking on an asteroid and firing a sensor into its core. The
project was canceled in 1992 as a result of congressional funding cuts.
Later, NASA realized some of the goals of this mission with its Stardust
and Deep Impact missions.

ExoMars Mission
The ExoMars Mission was to be a collaboration between NASA and the
European Space Agency that would have landed a mobile scientific
platform on Mars. The craft was supposed to then drill deep into the
subsurface of Mars and analyze those samples. Scientists know that
because of the hostile environment of the planet, proving that life once
existed on Mars would require drilling into the planet where erosion
hasn't had an effect. The platform was to land on Mars between 2016 and
2018. According to Space.com, the United States will likely tell the ESA
that it can no longer provide a launch vehicle for this mission due to
budget cuts.

The Moon
In 2003, President George W. Bush laid out a vision to return human
beings to the moon by 2020. In 2010, President Obama shifted the vision
from landing astronauts on the moon to developing lower-cost vehicles
that could act as space taxis. This vision included provisions to
incentivize NASA and private companies to develop lower-cost vehicles to
reach space. This emphasis came in the wake of the high-dollar space
shuttle program that proved to be more costly and less versatile than
originally planned.

The Bottom Line
The biggest of NASA's accomplishments and its failures are well known.
Who could forget the "one small step for man" event or the Challenger
and Columbia disasters? Opponents of the nation's space policy argue
that the space program has gone backwards. Michio Kaku, professor of
theoretical physics at the City University of New York, argues that
NASA's priorities are in desperate need of a new vision.

Priorities are often dictated by money. In a global economy where there
is little room for discretionary spending, funding for space exploration
has been put on hold around the world.

Read more:
http://www.sfgate.com/business/investopedia/article/5-NASA-Missions-You-
Didn-t-Know-Were-Canceled-3950797.php#ixzz29fySiJkj
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