answersLogoWhite

0

They first used parallax which makes sense but now they use radar signals. Radar signals travel at the speed of light and they send a powerful one out to rebound off of a planet and time how long it takes to return.

User Avatar

Wiki User

15y ago

What else can I help you with?

Related Questions

Why is it necessary for scientists to use AU to measure distance in space?

It's more convenient for scientists. AU is the distance the earth is from the sun.


What measurement do scientists use for the distance between stars and Earth?

scientists use light-years to measure long distances in space. a light year, (abrviated ly) is the distance light can travel.


Do scientists measure tsunamis from space?

Yea they do =)


How do you measure the distance or space of the distance clip?

how do you measure the distance or space of the distance clip. this clip use in textile spinning mills. it is errected on the craddle.


How to measure light years and what tools are used for this purpose?

Light years are a unit of distance used to measure vast distances in space. To measure light years, scientists use tools like telescopes and spectrographs to observe the light emitted by stars and galaxies. By analyzing the light's properties, such as its brightness and spectrum, scientists can calculate the distance to these celestial objects in terms of light years.


What is the measurement used to measure distance in space?

Distance in space is measured in 'light years' or in 'scientific notation'


What unit do scientists mesure huge distance in space in?

Scientists measure huge distances in space using units like light-years, which represent the distance that light travels in one year. This helps provide a more meaningful scale for understanding the vast distances between celestial objects.


What do scientists use to accurately measure the distance between the earth and the moon?

a stick.


How do scientists use computers to measure distance from stars?

From what I remember in two geology classes, scientists measure the distance between a star and Earth by comparing "red shift," a shifting of certain bands of light toward the "red" end of the spectrum. The further the shifting, the greater the distance.


How do you measure light years and what does it signify in astronomy?

Light years are a unit of measurement used in astronomy to indicate the distance that light travels in one year. This distance is about 5.88 trillion miles. Light years are significant in astronomy because they allow scientists to measure vast distances in space, such as the distance between stars, galaxies, and other celestial objects.


Why scientists use light years to measure distance in space in stead of kilometers?

It is far more convenient to express space distance in light years instead of kilometers. 1 light year = 9.4605 x 10^12 km 1 light year = 5.8745 x 10^12 miles


When would you use a light year?

When I want to measure a distance in space.