astronomy

Midcourse Space Experiment

Midcourse Space Experiment is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Midcourse Space Experiment rather than just read about it. In short: The Midcourse Space Experiment (MSX) is a Ballistic Missile Defense Organization (BMDO) satellite experiment (unmanned space mission) to map bright infrared sources in space. MSX offered the first system demonstration of technology in space to identify and track ballistic missiles during their midcourse flight phase.

Key takeaways

Midcourse Space Experiment belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Midcourse Space Experiment to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Midcourse Space Experiment from memory before moving on to harder problems.

Reference excerpt

The Midcourse Space Experiment (MSX) is a Ballistic Missile Defense Organization (BMDO) satellite experiment (unmanned space mission) to map bright infrared sources in space. MSX offered the first system demonstration of technology in space to identify and track ballistic missiles during their midcourse flight phase.

History On 24 April 1996, the US Air Force launched the MSX satellite on a Delta II launch vehicle from Vandenberg AFB, California. MSX was placed in a Sun-synchronous orbit at 898 km and an inclination of 99.16 degrees. MSX's mission was to gather data in three spectral bands (long wavelength infrared, visible, and ultraviolet). From 13 May 1998, MSX became a contributing sensor to the Space Surveillance Network.

Launch debris incident Lottie Williams was exercising in a park in Tulsa, Oklahoma on January 22, 1997, when she was hit in the shoulder by a 15-centimetre (6 in) piece of blackened metallic material. U.S. Space Command confirmed that a used Delta II rocket from the April 1996 launch of the Midcourse Space Experiment had re-entered into the atmosphere 30 minutes earlier. The object tapped her on the shoulder and fell off harmlessly onto the ground. Williams collected the item and NASA tests later showed that the fragment was consistent with the materials of the rocket, and Nicholas Johnson, the agency's chief scientist for orbital debris, believes that she was indeed hit by a piece of the rocket.

Operations Operational from 1996 to 1997, MSX mapped the galactic plane and areas either missed or identified as particularly bright by the Infrared Astronomical Satellite (IRAS) at wavelengths of 4.29 μm, 4.35 μm, 8.28 μm, 12.13 μm, 14.65 μm, and 21.3 μm. It carried the 33-cm SPIRIT III infrared telescope and interferometer–spectrometer with solid hydrogen-cooled five line-scanned infrared focal plane arrays.

Calibration of MSX posed a challenge for designers of the experiment, as baselines did not exist for the bands it would be observing under. Engineers solved the problem by having MSX fire projectiles of known composition in front of the detector, and calibrating the instruments to the known black-body curves of the objects. The MSX calibration serves as the basis for other satellites working in the same wavelength range, including AKARI (2006-2011) and the Spitzer Space Telescope (SST). MSX data is currently available in the Infrared Science Archive (IRSA) provided by NASA's Infrared Processing and Analysis Center (IPAC). Collaborative efforts between the Air Force Research Laboratory and IPAC has resulted in an archive containing images for about 15 percent of the sky, including the entire Galactic Plane, the Large Magellanic Cloud, and regions of the sky missed by IRAS.

Illustrations

Worked examples

Example 1 — a first encounter with Midcourse Space Experiment

Start with the simplest possible case. Write down what Midcourse Space Experiment claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Midcourse Space Experiment before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Midcourse Space Experiment ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Midcourse Space Experiment

In research: Midcourse Space Experiment appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Midcourse Space Experiment in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Midcourse Space Experiment is common in secondary-school and first-year university syllabi. It links to neighbouring topics Infrared telescopes, Space telescopes, Spacecraft launched by Delta II rockets, so understanding it makes those chapters shorter.
In everyday life: Look for Midcourse Space Experiment outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Midcourse Space Experiment in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Midcourse Space Experiment means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Midcourse Space Experiment out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Midcourse Space Experiment in simple terms?

Why does Midcourse Space Experiment matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Midcourse Space Experiment?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Midcourse Space Experiment.