Eta Carinae is hard to observe because
A.it is too far away.
B.there is too much dust and gas around it.
C.the binoculars are not powerful enough.
D.it does not send out infrared light.
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!