False
Yes
The method used to determine a star's speed of approach is called "radial velocity." This technique measures the star's motion towards or away from us along the line of sight by analyzing the Doppler shift in its spectral lines. The amount of shift in the spectral lines provides information about the star's speed and direction of motion relative to us.
earth method
Gigahertz is a unit of frequency equivalent to one billion hertz, commonly used to measure the clock speed of a computer processor. Example: The new computer processor operates at a speed of 3 gigahertz, making it faster than the previous model.
Currently the Intel i5 processor is the most famous processor being used in PCs and notebooks. You should look for a laptop with this processor, which will speed up everything you do.
The palindrome for an instrument used to determine speed is radar. It reads the same forwards and backwards.
The same method is used for both surface and submerged currents: you place a measuring instrument in the current to be measured, and you observe and note its progressions.
sounding technique
i is your birthday
Parallax is a method used to find the distances of stars.
PCR technology can be used to this field.