Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Conditions on Early Earth02:06

Conditions on Early Earth

2.8K
2.8K
Conditions on Early Earth02:06

Conditions on Early Earth

102.6K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
102.6K
Acceleration due to Gravity on Earth00:55

Acceleration due to Gravity on Earth

674
674
Acceleration due to Gravity on Earth01:21

Acceleration due to Gravity on Earth

12.2K
According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is...
12.2K
Escape Velocity01:26

Escape Velocity

8.6K
The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field?
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite...
8.6K
Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

5.1K
The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
5.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Viking Mars, Now 50 Years Old, Still Needs a Scientific Analysis.

Astrobiology·2025
Same author

Exploring organic compound preservation through long-term in situ experiments in the Atacama desert and the relevance for Mars.

Scientific reports·2025
Same author

Planetary Protection and the astrobiological exploration of Mars: Proactive steps in moving forward.

Advances in space research : the official journal of the Committee on Space Research (COSPAR)·2025
Same author

Viability and Motility of <i>Escherichia coli</i> Under Elevated Martian Salt Stresses.

Life (Basel, Switzerland)·2025
Same author

Inside the Atacama Desert: uncovering the living microbiome of an extreme environment.

Applied and environmental microbiology·2024
Same author

Microbial preference for chlorate over perchlorate under simulated shallow subsurface Mars-like conditions.

Scientific reports·2024
Same journal

The Viking's 50 Year Landing Anniversary Astrobiology Special Collection: Reexamining the Revolutionary Impact of Viking on Mars Exploration.

Astrobiology·2026
Same journal

Viking's Astrobiological Legacy: A Philosophical Framework for Searching for Molecular Biosignatures.

Astrobiology·2026
Same journal

NASA Viking Mission: A Perspective of the Labeled Release Biological Experiment on Mars.

Astrobiology·2026
Same journal

Plasma and Thermal Processing Leading to Latitudinal and Temporal Variability of the Trapped O<sub>2</sub> at Europa and Ganymede.

Astrobiology·2026
Same journal

The Possible Aqueous Origins of Manganese Alteration Minerals in the Máaz Formation of Jezero Crater.

Astrobiology·2026
Same journal

Viking's Heirs: The Rise of Planetary Flyers.

Astrobiology·2026
See all related articles

Related Experiment Video

Updated: Mar 11, 2026

Freezing Human ES Cells
08:00

Freezing Human ES Cells

Published on: October 12, 2006

24.1K

Another Earth 2.0? Not So Fast.

Dirk Schulze-Makuch1,2, Edward Guinan3

  • 11 Center for Astronomy and Astrophysics, Technical University Berlin , Berlin, Germany .

Astrobiology
|November 22, 2016
PubMed
Summary
This summary is machine-generated.

While thousands of exoplanets have been discovered, few are truly Earth-like. Detecting a habitable planet with complex ecosystems remains a distant technological goal.

More Related Videos

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

4.0K
Using Generative Art to Convey Past and Future Climate Transitions
06:10

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

1.5K

Related Experiment Videos

Last Updated: Mar 11, 2026

Freezing Human ES Cells
08:00

Freezing Human ES Cells

Published on: October 12, 2006

24.1K
Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

4.0K
Using Generative Art to Convey Past and Future Climate Transitions
06:10

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

1.5K

Area of Science:

  • Exoplanetary Science
  • Astrobiology

Background:

  • Over 3000 exoplanets confirmed, with nearly 5000 candidates awaiting verification.
  • Frequent discoveries of Earth-mass planets in habitable zones fuel public excitement for a 'Second Earth'.
  • Current exoplanet characterization relies on limited geophysical parameters, not comprehensive habitability assessments.

Purpose of the Study:

  • To temper public expectations regarding the discovery of Earth-like exoplanets.
  • To clarify the distinction between planets in the habitable zone and genuinely Earth-like planets.
  • To emphasize the technological challenges in detecting complex ecosystems on exoplanets.

Main Methods:

  • Analysis of exoplanet data from the NASA Exoplanet Archive.
  • Review of geophysical parameters used for exoplanet classification.
  • Conceptual definition of 'Earth-like' criteria, including environmental diversity and biosignatures.

Main Results:

  • A small fraction of discovered exoplanets possess crude geophysical similarities to Earth.
  • The definition of 'Earth-like' necessitates multiple habitats, a substantial biosphere, and complex ecosystems.
  • Current technology is insufficient for the certain detection of Earth-like planets or 'Earth 2.0'.

Conclusions:

  • Public interpretation of exoplanet discoveries needs careful management to avoid overstatement.
  • True Earth-like planets, with conditions supporting life as we know it, are likely rare and difficult to detect.
  • Significant technological advancements are required to confirm the existence of habitable planets with complex life.