title: error: couldn't open .png
body: <p>Can someone help me identify where I went wrong? Thanks. I get: <code>pygame.error: Couldn't open space.png</code>.  My code is as follows:</p>
  
  <pre><code>import random, math, pygame
  from pygame.locals import *
  pygame.init()
  screen = pygame.display.set_mode((800,600))
  pygame.display.set_caption("orbit demo") 
  
  space = pygame.image.load("space.png").convert()
  
  
  while True:
      for event in pygame.event.get():
          if event.type == QUIT:
              sys.exit()
  
      keys = pygame.key.get_pressed()
      if keys[K_ESCAPE]:
          sys.exit()
  
      #draw backgroud
      screen.blit(space, (0,0))
      pygame.display.flip()            
  </code></pre>