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The most recent information we can receive about the star would be from about 100 years ago, as it takes light around 100 years to travel a distance of 100 light years from the star to reach us on Earth.
By the color.
Yes, the mass of a planet can be determined by observing its transit across a star. By measuring the duration and depth of the transit, scientists can calculate the planet's size and mass based on the gravitational influence it exerts on the star. This method is known as the transit method and is commonly used in exoplanet studies.
Stellar masses can be determined by observing binary star-systems. The calculations of the orbits of the binary stars allow the masses of their component stars to be directly determined, which in turn allows other stellar parameters, such as radius and density, to be indirectly estimated.
It appears to move because it is a moving object and you are observing it from Earth.
Yes, a planet's mass can be determined by observing its transit across a star. By measuring the dip in the star's brightness during the transit, astronomers can calculate the size of the planet and its gravitational effect on the star, which provides information on the planet's mass.
The most recent information we can receive about the star would be from about 100 years ago, as it takes light around 100 years to travel a distance of 100 light years from the star to reach us on Earth.
By the color.
When observing a star, you will see a bright point of light in the night sky.
Spectroscopy shows what elements are present in the star, it's chemical composition. The different elements give off different energy signatures through radiation, which relate to the wavelength and therefore colour.
observing
Discovering the essential Universe by Neil F. Comins fourth edition Extrasolar planets can be discovered by observing them indirectly by using microlensing, by observing the Doppler shift of the star due to the pull of the orbiting planet, by observing the periodic variation of the proper motion of a star, and by observing the periodic variation of the starlight due to the planet passing between that star and Earth, an event called a transit.
observing
research or background information
Data or information gathered from observing the growth of a fish over a month would generally be referred to as growth data or growth observations.
Outerspace ... the twinkling effect happens when observing the star(s) through earth's atmosphere. If you were in space, they would not twinkle.
Observing is seeing for yourself what actually happened. Inferring is taking other information and trying to guess what actually happened.