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What do scientists use to accurately measure the size of galaxies and black holes etc and are those methods even accurate?
If you know how far away it is, and the angle that it subtends, you can tell its size. For example, if something is 100 meters away and it fills 10 milliradians, it's 100 * 0.01 = 1 meter across. (A milliradian is 1/1000 of a radian, and a radian is about 57 degrees.)
The size in your telescope is easy, and it's a simple optical calculation to figure out how large an angle it actually takes up. That is, so long as it's something that appears as an object, not just a point. So the method will work with a galaxy, but not a black hole.
The only part with uncertainty is how far away it is. The red shift of the light can tell you that. Everything in the universe is moving apart, and the farther away something is the faster it is moving, so the greater the red shift. This method has been calibrated in a number of ways, in particular by observing certain types of variable stars. So that part of the method is pretty solid, too.
What else can I help you with?
What is the type of star used by Hubble to measure the distance to other galaxies?
what is the type of star used by the Hubble to measure the distance to other galaxies.
Why is it important to measure accurately?
it is important to measure mass accuratley because if you dont everything is going to fail.
How do you accurately measure volume of a liquid?
To accurately measure the volume of a liquid, use a graduated cylinder or a beaker with volume markings. Make sure the liquid is level with your eye at the bottom of the meniscus (the curved surface of the liquid). Read the measurement at the bottom of the meniscus for an accurate volume.
What are to units that scientists use to measure temperature?
To measure temperature, scientists use:KelvinCelsiusFahrenheit.
What is the most appropriate piece of equipment to accurately measure 85 mL of water?
100mL of measuring cylinder is the most appropriate (more than beaker) piece of equipment to measure 85mL of water.
What do scientists use to accurately measure the distance between the earth and the moon?
a stick.
Why is it difficult to measure the Hubble constant H?
Both the speed and the distance of distant galaxies must be measured accurately.
How can I accurately measure the size of a tube?
To accurately measure the size of a tube, use a measuring tape or caliper to determine the diameter of the tube. Measure across the widest part of the tube to get an accurate measurement.
How do scientists weigh things in space?
They measure the velocity of the object after applying a accurately measured force.
How to measure bike handlebars accurately?
To measure bike handlebars accurately, use a tape measure to determine the width from end to end. Make sure to measure from the center of the handlebars for an accurate reading. This measurement is typically in millimeters.
How to measure bicycle handlebars accurately?
To measure bicycle handlebars accurately, use a tape measure to determine the width between the two ends of the handlebars. Measure from the center of one end to the center of the other end for an accurate measurement.
How can I accurately measure the diameter of a vacuum hose?
To accurately measure the diameter of a vacuum hose, use a caliper or ruler to measure the width of the hose opening. Make sure to measure across the widest part of the opening for an accurate measurement.
How to measure handlebar size accurately?
To measure handlebar size accurately, use a measuring tape to determine the width of the handlebars from end to end. Make sure to measure at the widest point of the handlebars for an accurate measurement.
How can I accurately measure the length of a screw?
To accurately measure the length of a screw, use a ruler or caliper to measure from the tip to the end of the screw. Make sure to align the measuring tool parallel to the screw for an accurate measurement.
How to measure a screw length accurately?
To measure the length of a screw accurately, use a ruler or caliper to measure from the tip to the end of the screw. Make sure to align the measuring tool parallel to the screw for an accurate measurement.
Why do scientist use measuring tools?
Scientists have to measure things accurately or else science would be pointless,
How can I accurately measure the diameter of a bike wheel?
To accurately measure the diameter of a bike wheel, use a tape measure or ruler to measure the distance across the wheel from one edge of the tire to the opposite edge. Make sure to measure from the center of the wheel to get an accurate diameter.
