Astronomers have come up with two different techniques to estimate how far away any given star is. The first technique uses triangulation (a.k.a. parallax). The Earth's orbit around the sun has a diameter of about 186 million miles (300 million kilometers). By looking at a star one ...
it took astronomers thousands of years to figure out how to measure distances of stars from our planet and create actual three-dimensional maps reflecting the distribution of stars and galaxies in the universe. One of the key methods they use is the so-called parallax, which relies on ...
Some stars are relatively close (the closest 30 stars are within 40 parsecs) and others are far, far away. Astronomers can measure the distance by using a method called parallax, in which the change in a star's position in the sky is measured at different times during the year. Some ...
What is the parallax of Alpha Centauri? How far can the Hubble Telescope zoom in? How long does it take for light to reach earth from a star that is 8 light-years away? a) 8 earth minutes b) 16 earth minutes c) 8 earth years d) 16 earth years ...
At EPFL, the Standard Candles and Distances research group headed by Prof. Richard Anderson is aiming to measure the current expansion of the Universe and sees Gaia as a valuable tool. “Gaia increased by a factor of 10,000 the number of stars whose parallaxes are measured thanks to a mass...
Why might astronomers measure the parallax of stars? How does the Hubble Telescope transmit data? Why is a light-year a more useful measurement in astronomy than a meter is? How do astronomers use celestial coordinates? How do you calculate an astronomical unit?
What sort of astronomical objects are still usually measured in AU, and when might objects be too far away for the measurement to make sense? The AU remains the baseline for any trigonometric parallax measurements, so nearly all distances measured in the Milky Way (MW), such as from the ESA...
A wall or frame gives you a fixed point from which you can get a reading which won’t be affected by parallax error. You will also need to be standing near the dog. Small dogs such as puppies, Chihuahuas, and French Bulldogs are quite playful, and making them stand still on the floo...
Similar Questions Obtain in expression for the time period T of a simple pendulun. The time period depend upon (i) mass 'm' of the bob (ii) length 'l' of the pendulum and (iii) acceieration due to gravity g at the place where the pendulum is suspended. (Constant k =2π) i.e...
I have found the best way to measure pupil size is to use an aperture mask on a refractor. With appropriate choice of telescope and eyepiece you can create an exit pupil larger than the size range you want to detect, and then find the actual size by stopping it down. This works well ...