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Users can read about how distances are measured in the solar system. Attempts by early astronomers to estimate distances and ongoing work to establish and refine the astronomical unit (the mean distance from the Earth to the Sun) are described. This is part of NASA's online book entitled "From Stargazers to Starships" and links to other parts of the site and to related topics are provided.
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This resource focuses on NASA's interplanetary exploration and discovery missions. The site features links to topics that include news, the planets, missions (current and past), science and technology, a multimedia gallery of images and animations, NASA employees, a kids' section, and education and history sections.
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This
site,
originally
published
as
part
of
NASA's
History
Series,
presents
a
detailed
history
of
the
Apollo
program.
The
story
begins
in
the
1950s
with
early
efforts
to
beat
the
Soviet
Union
into
space,
carries
through
the
Kennedy
administration,
with
its
famous
challenge
to
land
a
man
on
the
moon
and
return
him
safely
to
Earth
by
the
end
of
the
1960s,
and
culminates
with
the
landing
of
Apollo
11
...
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This
website,
produced
by
the
Kennedy
Space
Center,
provides
histories
of
NASA's
manned
space
missions,
beginning
with
the
first
flights
by
American
astronauts
in
the
Mercury
program
and
proceeding
through
the
latest
missions
of
the
Space
Shuttle
and
International
Space
Station.
Each
section
features
mission
goals
and
summaries,
descriptions
and
pictures
of
the
spacecraft,
and
stories
about
the
astronauts
...
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This
site,
produced
by
the
Kennedy
Space
Center,
presents
the
complete
history
of
the
Apollo
Program,
a
series
of
missions
which
ultimately
resulted
in
manned
landings
on
the
Moon.
It
features
sections
on
mission
goals,
spacecraft,
and
summaries
of
both
manned
and
unmanned
missions.
Mission
summaries
describe
each
flight
crew,
the
conduct
of
each
flight
and
landing,
and
accounts
of
experiments
that
...
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Astronomers
estimate
the
age
of
the
universe
in
two
ways:
by
looking
for
the
oldest
stars,
and
by
measuring
the
rate
of
expansion
of
the
universe
and
extrapolating
back
to
the
Big
Bang.
This
site
explains
how
these
measurements
are
made
and
points
out
the
discrepancy
in
ages
derived
from
the
two
methods.
It
features
images,
background
information,
and
links
to
other
resources
regarding
the
age
of
...
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This site explains how supernovae can be detected and studied by measuring the decay of radioactive elements in the material ejected from them. It is part of the Goddard Space Flight Center's "Imagine the Universe" website, created by GSFC's Laboratory for High Energy Astrophysics. It includes text, remotely sensed imagery, and links to other topics related to high energy astrophysics.
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This site consists of JPEG images of the planets, including photographs of Jupiter, Mars, Saturn, historic photographs, and artistic illustrations (montages). Links to other parts of the GRIN image library are provided.
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This is a JPEG image of the planets in the solar system arranged as a montage. It is part of the GRIN (Great Images in NASA) library of images, which consists of photographs and other illustrations that are browsable by subject, NASA Center, or keyword.
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This simulated image of the Van Allen Belts is part of the Great Images in NASA (GRIN) library, a collection of JPEG images which is browseable by subject, NASA center (Goddard, Jet Propulsion Laboratory, etc.), or by keyword. Links to other parts of the GRIN website are included.
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