If you can reject the null hypothesis, it provides support for the alternative hypothesis. Null hypothesis testing is the basis of the principle of falsification in science.

This initial statement is called the Null Hypothesis and is denoted by Ho. An alternative or alternate hypothesis (denoted Ha), is then stated which will be the opposite of the Null Hypothesis.

In his popular series, Andrew Vickers, PhD, discusses the null hypothesis, using surgical infection rates to demonstrate a problem in interpretation.

Unfortunately, you have to assume that your alternate hypothesis is wrong until you find evidence to the contrary. So it's innocent until proven guilty for the aliens.

This study proposes robust means modeling (RMM) approaches for hypothesis testing of mean differences for between-subjects designs in order to control the biasing effects of nonnormality and variance ...