What is the gravitational microlensing in astronomy?
Gravitational microlensing, brightening of a star by an object passing between the star and an observer. In this way, an extrasolar planet can act as a gravitational lens that would focus the light from a more distant star.
What is a possible consequence of gravitational microlensing?
Microlensing is based on the gravitational lens effect. A massive object (the lens) will bend the light of a bright background object (the source). This can generate multiple distorted, magnified, and brightened images of the background source.
What are the four different types of exoplanets?
So far scientists have categorized exoplanets into the following types: Gas giant, Neptunian, super-Earth and terrestrial.
Why are Einstein rings blue?
A Quirk Of Gravity Created This Bizarre Blue Ring In The Deep Universe. ESA/Hubble & NASA What you’re seeing here is an illusion. The light is real but the bizarre blue ring is a fake — an imposter created by a cosmic trick called gravitational lensing.
Who find Einstein ring?
Hewitt et al.
The first Einstein ring was discovered by Hewitt et al. (1988), who observed the radio source MG1131+0456 using the Very Large Array. This observation saw a quasar lensed by a nearer galaxy into two separate but very similar images of the same object, the images stretched round the lens into an almost complete ring.
How is microlensing used to detect exomoons?
In 2002, Cheongho Han & Wonyong Han proposed microlensing be used to detect exomoons. The authors found detecting satellite signals in lensing light curves will be very difficult because the signals are seriously smeared out by the severe finite-source effect even for events involved with source stars with small angular radii.
Is there such a thing as an exomoon Moon?
An exomoon or extrasolar moon is a natural satellite that orbits an exoplanet or other non-stellar extrasolar body. It is inferred from the empirical study of natural satellites in the Solar System that they are likely to be common elements of planetary systems. The majority of detected exoplanets are giant planets.
Is it possible to detect exomoons in space?
Therefore, it is reasonable to assume that exomoons are equally common. Though exomoons are difficult to detect and confirm using current techniques, observations from missions such as Kepler have observed a number of candidates, including some that may be habitats for extraterrestrial life and one that may be a rogue planet.
Are there any exomoons in the Solar System?
Though exomoons are difficult to detect and confirm using current techniques, observations from missions such as Kepler have observed a number of candidates, including some that may be habitats for extraterrestrial life and one that may be a rogue planet. To date there are no confirmed exomoon detections.