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How long does it take to see an object one light year away Suppose an object is one light year away from me. How long does it take for me to see the object with a telescope and how to calculate the time? Please answer in detail. Thank you first
According to the special theory of relativity, it's a year, because it takes a year for the light from the object to reach you, that is to say, the object you see now is what it looked like a year ago
A light year is a lot of distance? Thank you
A light year is equivalent to 9460730472580 meters (accurate). A light year is a unit of length. It refers to the distance that light travels in a year, that is, about 9460 billion kilometers (or 5880 billion miles)
In 1961, astronaut () realized the first space flight by spaceship
Options:
a. Armstrong
b. Gagarin
c. Masgrave
d. Komarov
b. Gagarin
At 9:07 a.m. Moscow time on April 12, 1961, Gagarin took the "Orient" 1 spacecraft to set sail from the Baikonur launch site, circled the earth in an orbit with a maximum altitude of 301 km, lasted for 1 hour and 48 minutes, and landed in the Soviet Union at 10:55 a.m., completing the world's first manned space flight and realizing human's desire to enter space
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