Pressumably, they didn't have the high-precision devices required to measure those angles. You must consider that we are talking about extremely small angles - even the closest star has a parallax of less than one arc-second (1/3600 of a degree).
'Dark matter' and 'dark energy' have not been observed or proven yet.
Astronomers are unable to prove the existence of dark matter & dark energy.In fact astronomers have not yet proved most astronomical effects. Worm holes, black holes, or even the big bang. But proof in theories is almost impossible. The longer a theory stays intact is a sign of it's "proof" but some "sane" theories have been proven to be incorrect - "Einsteins biggest blunder".No scientist will say they have proved anything "astronomical" as it is almost impossible to prove anything without physical interaction.It's a bit like saying "I can prove that dogs live in the next street" based on only hearing their barks and not actually going there.
There are several speculative ideas in astronomy, which can't currently be proved - nor completely disproved. Some of these include wormholes; parallel universes; the possibility of time travel and faster-than-light travel.
Explain why the light is unable to reach the screen
because the moon is rising
they couldn't measure small angles
Galileo was unable to resolve the rings of Saturn as individual objects with his telescope. They appeared to him as "ears" or handles attached to the planet. The true nature of Saturn's rings was not understood until later observations with more powerful telescopes.
'Dark matter' and 'dark energy' have not been observed or proven yet.
'Dark matter' and 'dark energy' have not been observed or proven yet.
its not bad dnt worry but its just to early
No. We would be unable to detect it but you can detect black holes(by xrays and light emmitted from material they are sucking up). You would be unable to detect it because if the two were moving away at a combined speed greater than that of light then light from the star could never reach the earth.
There are several reasons why a computer is unable to detect a pen drive. One common reason is that the computer does now know what drive letter to assign to the memory stick. One quick fix is to change the drive letter in the administrative tools of the control panel.
He was an unregistered animagus. He escaped by turning himself into his animal form which the Dementors were unable to detect.
You can do HPV genotyping to know high risk and low risk type of HPV.
Wired Ethernet can physically detect collisions, WIFI can't.
We can get information from any portion of the electromagnetic spectrum provided we use the correct "listening" devices; that is the entire range, Radio, microwave, infrared, visible, ultra violet, xray, and gamma rays
We're unable to see your paper, and since you didn't offer any options, we're not able to guess what choices you have.