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Kepler's First Law of Planetary Motion

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...

States of Water

States of Water

Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...

Conditions on Early Earth

Conditions on Early Earth

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.

Conditions on Early Earth

Conditions on Early Earth

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.

Acceleration due to Gravity on Other Planets

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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...

Kepler's Second Law of Planetary Motion

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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...

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Updated: May 11, 2026

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

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

Published on: May 10, 2020

Exoplanet habitability.

¹Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. seager@mit.edu

Science (New York, N.Y.)

|May 4, 2013

Summary

This summary is machine-generated.

The search for exoplanets reveals diverse worlds beyond our solar system. New research suggests even Earth-like planets may harbor conditions suitable for extraterrestrial life.

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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

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

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

Published on: May 10, 2020

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Published on: February 27, 2021

Area of Science:

Exoplanetary science
Astrobiology

Background:

Thousands of exoplanets and candidates exhibit significant diversity in mass, size, orbit, and host star type.
Novel planetary types, common yet unlike those in our solar system, are frequently discovered.

Purpose of the Study:

To explore the potential for habitability in a wide range of exoplanetary environments.
To broaden the definition of potentially life-supporting conditions beyond Earth-centric models.

Main Methods:

Analysis of existing exoplanet data.
Comparative planetology focusing on surface temperature and liquid water potential.

Main Results:

Exoplanet diversity extends to types with no solar system analogues.
Planets significantly different from Earth may possess conditions favorable for life.

Conclusions:

The search for habitable exoplanets benefits from considering a broader range of planetary types.
Increased possibilities for discovering inhabited worlds arise from a more inclusive view of habitability.