Cosmology gravitational waves

How are gravitational waves used in astronomy?
Instead, it measures gravitational waves: tiny ripples in the structure of spacetime created by colliding black holes, neutron stars, or other powerful cosmic events.
Gravitational wave astronomy allows us to probe a new part of the unseen universe, with its own challenges and knowledge we can't get other ways..
How did they prove gravitational waves?
How do we know that gravitational waves exist? In 2015, scientists detected gravitational waves for the very first time.
They used a very sensitive instrument called LIGO (Laser Interferometer Gravitational-Wave Observatory).
These first gravitational waves happened when two black holes crashed into one another..
What is the study of gravitational waves?
In 2015, scientists detected gravitational waves for the very first time.
They used a very sensitive instrument called LIGO (Laser Interferometer Gravitational-Wave Observatory).
These first gravitational waves happened when two black holes crashed into one another.
The collision happened 1.3 billion years ago..
Researchers have found the first direct evidence of a “background” of gravitational waves in the universe — a sign that gravitational waves from slowly merging pairs of supermassive black holes, or possibly from the early universe, can be detected from Earth in a background field of low-frequency energy.
With help from several ground-based telescopes in the United States and Canada, NANOGrav created a network of precisely timed pulsars, which allows NANOGrav researchers to measure and track previously undetected gravitational waves at low frequencies as they make their way to Earth.

Gravitational waves are 'ripples' in space-time caused by some of the most violent and energetic processes in the Universe. Albert Einstein predicted the existence of gravitational waves in 1916 in his general theory of relativity.

Light

Scientists picture light as streams of photons, particles representing the smallest possible packets of light energy.
Light behaves both as if it’s made up of particles and as if it’s made up of waves.
While we usually talk about light in terms of waves, it’s really a bit of both.
Different types of light combine into a collection called the electr.

Particles

Many cosmic objects and events also eject high-speed particles.
In some cases, particles allow scientists to peer into places that cannot be seen with light.
For example, some particles can escape extremely dense environments where even light might struggle to get out, like inside dying stars.
Cosmic particles come in two classes –neutrinos and cos.

Sensing The Universe

We experience the world through different senses: sight, touch, taste, hearing, and smell.
Similarly, astronomers now study the universe using different messengers: light, particles, and space-time ripples called gravitational waves.
They can learn much more about cosmic objects and events by combining information from multiple messengers than by u.

Shift of wavelength of a photon to longer wavelength

In physics and general relativity, gravitational redshift is the phenomenon that electromagnetic waves or photons travelling out of a gravitational well lose energy.
This loss of energy corresponds to a decrease in the wave frequency and increase in the wavelength, known more generally as a redshift.
The opposite effect, in which photons gain energy when travelling into a gravitational well, is known as a gravitational blueshift.
The effect was first described by Einstein in 1907, eight years before his publication of the full theory of relativity.

Cosmology gravitational waves

How are gravitational waves used in astronomy?

How did they prove gravitational waves?

What is the study of gravitational waves?

Light

Particles

Sensing The Universe