Final answer:
An object that is blueshifted is moving toward the observer. This is due to the Doppler effect, where the light waves are compressed, shifting the wavelength towards the blue end of the spectrum.
Step-by-step explanation:
If an object in space is blueshifted, then the object is moving toward the observer. The phenomenon of blueshift occurs because the light waves from the object are compressed as the object moves closer, causing the wavelengths to decrease and shift towards the blue end of the spectrum. This is a result of the Doppler effect, which also explains why objects moving away from the observer are redshifted, as their light waves are stretched out, resulting in longer wavelengths and a shift towards the red end of the spectrum.