Top Posters
Since Sunday
H
1
1
O
1
New Topic  
sperry263 sperry263
wrote...
Posts: 148
Rep: 0 0
3 weeks ago

Why do scientists consider it to be very unlikely that UFO reports are due to visitors from another solar system?



Interstellar travel requires huge amounts of time and energy.



There is no evidence that life exists elsewhere in the universe.



No scientist has ever seen a UFO.



Scientists believe that any alien civilization would be much more advanced than humans.

Textbook 
ASTRO

ASTRO


Edition: 3rd
Authors:
Read 68 times
1 Reply
Replies
Answer verified by a subject expert
dm408dm408
wrote...
Posts: 160
Rep: 0 0
3 weeks ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here
1

Related Topics

sperry263 Author
wrote...

3 weeks ago
Helped a lot
wrote...

Yesterday
Smart ... Thanks!
wrote...

2 hours ago
Thanks
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1001 People Browsing
Related Images
  
 194
  
 4469
  
 400
Your Opinion
Which country would you like to visit for its food?
Votes: 261

Previous poll results: What's your favorite math subject?