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Related Concept Videos

Light as Energy01:35

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
The Wave Nature of Light02:12

The Wave Nature of Light

The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: May 12, 2026

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

Light and shadow from distant worlds.

Drake Deming1, Sara Seager

  • 1Planetary Systems Laboratory, Code 693, NASA's Goddard Space Flight Center, Greenbelt, Maryland 20771, USA. Leo.D.Deming@nasa.gov

Nature
|November 20, 2009
PubMed
Summary
This summary is machine-generated.

Exoplanets, or planets outside our solar system, are increasingly discovered via transits. Future research will focus on finding and characterizing potentially habitable exoplanets, including Earth-like worlds.

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

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Last Updated: May 12, 2026

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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

Area of Science:

  • Astronomy and Astrophysics
  • Exoplanetary Science
  • Astrobiology

Background:

  • Over 370 exoplanets (planets orbiting stars other than our Sun) are currently known.
  • A significant portion of exoplanet discoveries utilize the transit method, observing the dip in starlight as a planet passes in front of its star.
  • The transit method allows for the measurement of exoplanet masses and radii, and atmospheric gas detection for giant planets.

Purpose of the Study:

  • To outline the current state and future prospects of exoplanet detection and characterization.
  • To highlight the significance of the transit method in exoplanetary science.
  • To project the discovery and study of potentially habitable exoplanets in the near future.

Main Methods:

  • Transit photometry: Detecting exoplanets by observing the periodic dimming of a star's light.
  • Spectroscopy: Analyzing the light passing through an exoplanet's atmosphere to identify gases.
  • Observational astronomy: Utilizing telescopes to discover and study exoplanets.

Main Results:

  • Dozens of exoplanets have had their masses and radii determined using transit data.
  • Atmospheric gases have been successfully identified in several giant exoplanets.
  • The transit method has proven effective for exoplanet discovery and characterization.

Conclusions:

  • The transit method is a powerful tool for exoplanet research.
  • Future advancements aim to discover and study habitable rocky exoplanets around red dwarf stars.
  • The ultimate goal includes imaging Earth-like exoplanets around Sun-like stars.