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Related Concept Videos

The Scientific Method03:50

The Scientific Method

Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions. To achieve this, scientists follow a definitive series of steps that together make up the Scientific Method. This approach involves making observations, asking questions, building a hypothesis, conducting experiments, analyzing results, and forming a conclusion.
The Scientific Method01:32

The Scientific Method

The scientific method is a detailed, empirical problem-solving process used by biologists and other scientists. This iterative approach involves formulating a question based on observation, developing a testable potential explanation for the observation (called a hypothesis), making and testing predictions based on the hypothesis, and using the findings to create new hypotheses and predictions.Generally, predictions are tested using carefully-designed experiments. Based on the outcome of these...
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Magnetism01:30

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Updated: Jun 17, 2026

The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression
07:47

The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression

Published on: August 8, 2018

Viking Science.

Benton C Clark1

  • 1Space Science Institute, Boulder, Colorado, USA.

Astrobiology
|June 16, 2026
PubMed
Summary
This summary is machine-generated.

The Viking missions found ambiguous evidence for life on Mars. Despite this, the missions significantly advanced our understanding of Mars, revealing past conditions favorable for life and its potential habitability.

Keywords:
Viking—Mars—Life—Astrobiology—Geology—Exploration

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Area of Science:

  • Planetary Science
  • Astrobiology
  • Mars Exploration

Background:

  • The Viking missions comprised two orbiters and two landers sent to Mars.
  • All missions exceeded their planned operational durations and scientific goals.

Purpose of the Study:

  • To search for evidence of life on Mars using identical payloads on orbiters and landers.
  • To assess the habitability of Mars through environmental and geological measurements.

Main Methods:

  • Utilized 40 science experiments across four spacecraft.
  • Focused on experiments designed to detect biological activity on the Martian surface.
  • Conducted measurements of contemporaneous and past environmental conditions.

Main Results:

  • One experiment yielded positive results suggestive of life, but these were not conclusive due to potential nonbiological explanations.
  • Other experiments provided significant data advancing Mars science.
  • Evidence was found for past Martian conditions more favorable to life than present conditions.

Conclusions:

  • Mars remains a prime candidate for the origin and evolution of life beyond Earth.
  • The planet is considered the most likely candidate for extraterrestrial life in our solar system.
  • Mars presents potential habitability for the human species, making it a key target for future exploration.